Worried that you may have a system problem, and want to put yourPC through its paces to find potential issues? Then CheckItDiagnostics might be for you.

1. Checkit Software

Unlike most other system analyzers,it doesn't just report to you what's underneath the hood-itactually performs diagnostics, like a car mechanic, to see whetheryou have any underlying hardware woes.CheckIt Diagnostics does a comprehensive job of looking forsystem problems. It performs in-depth tests of your RAM, hard disk,network hardware and setup, USB ports, printers and other attacheddevices, display.pretty much any piece of hardware on yoursystem. It also checks your software setup, to see if there are anyproblems as well. You don't need to do anything beyond clicking abutton or two to set the program to work.

Keep in mind, though,that while it does its testing, you can't use your PC; using the PCwhile it's undergoing tests might create inaccurate results.Typically, tests don't take more than five or ten minutes.Who should buy this program? If you think you already havehardware woes, it's cheaper than bringing your PC to a technician.Keep in mind, though, that it doesn't fix problems; it onlyuncovers them. And if you don't have hardware problems, it may notbe worth buying CheckIt Diagnostics, unless you're looking touncover potential problems before you notice them.Note: This link takes you to the vendor's site, where youcan download the latest version of the software.-Preston Gralla.

Free Online DiagnosticsOnline diagnostic tools allow you to diagnose and troubleshoot your machine (or someone else's) without having to install extraneous software, or run scans on suspicious files or links without having to plug in an antivirus suite. While they're not quite as powerful as dedicated software and they have to operate through a browser layer, online tools can provide some extra utility and can help you track down issues with your hardware, software, or internet connection. They can even scan for viruses and malware. Here's a list of a few helpful online diagnostic tools.Note: Many of these free tools are provided as companions and gateways to paid diagnostic and security software, so don't be surprised if you're nagged to purchase a company's full internet security suite or paid.

Prev Page 1 of 11 Next Prev Page 1 of 11 Next. PC Pitstop OverdrivePC Pitstop has been around for years, providing free online computer diagnostics to users along with its other products. PC Pitstop's latest incarnation of its online diagnostics package, Overdrive, is fast, efficient, and can quickly and fairly accurately assess your hardware and software, going so far as to look up your computer security settings, drivers that need updating, and loads of other minutia. Diagnostic results are then presented in a clear, hyperlinked format with links defining technical terms and recommending solutions. If there's any complaint we have, it's that the diagnostics are best performed through Internet Explorer due to the use of ActiveX controls. If IE isn't your main browser, you'll need some kind of plugin for ActiveX to even get a scan running.Verdict: Fast, powerful and reliable, PC Pitstop Overdrive provides a good general use diagnostic of the ins and outs of a computer.Score: 4.5/5 Prev Page 2 of 11 Next Prev Page 2 of 11 Next.

Speedtest.netWhen it comes to checking the speed of your internet connection, Speedtest.net is one of the best online tools around, quickly and efficiently testing your upload and download speeds with the click of a button. After getting the results, you can see how well your speed stacks up against the speeds of those around the world. Are you really getting the speed you're paying for? Keep your ISP honest with this simple utility.Verdict: A quick, one-button utility that does exactly what it says on the tin. It's a great way to find out if your sluggish online performance is due to a connection problem, or something else. Also great for keeping your ISP honest when it comes to advertised and actual.Score: 4/5 Prev Page 3 of 11 Next Prev Page 3 of 11 Next. Pingtest.netOf course, speed isn't everything.

Quality of connection is also a factor. Pingtest.net, by the same developers of Speedtest.net, is another simple diagnostic tool that checks for packet loss, as well as ping values when sending data to and from nearby servers. Ideally, a good connection has absolutely no packet loss, as well as minimal ping values.Verdict: Another great one button diagnostic tool for your internet connection.

Ping is much more variable, related to distance to the server, but jitter and packet data loss metrics are important to watch for.Score: 4/5 Prev Page 4 of 11 Next Prev Page 4 of 11 Next. Down For Everyone or Just Me?Ever had trouble connecting to a particular website and had to to double-check if it was online? 'Down For Everyone Or Just Me?'

Saves you that hassle by allowing you to input a URL and then have the service check whether the website is is up or not. This simple check can tell you whether a particular website is down, and if it isn't, then your inability to connect may be the result of some other problem, such as malware infections blocking or redirecting you from a site.Verdict: A quick tool that does exactly what it says and can help reveal signs of infection.Score: 3/5 Prev Page 5 of 11 Next Prev Page 5 of 11 Next.

Symantec Security CheckMoving on to online security diagnostics, first up is Symantec's Security Check, a free online utility. A two-part tool that first checks your browser, system, and anti-virus for common vulnerabilities, and then runs a quick, on-demand virus scan for common threats in critical areas of your system. Unfortunately, the scan itself depends (again) on ActiveX controls, an iffy proposition if you're not using Internet Explorer.Verdict: While the system security scan is neat and useful for plugging potential vulnerabilities, the requirement for ActiveX controls limits the utility for anyone not using IE.

What's more, the antivirus feature does feel somewhat superfluous if you already have an antivirus suite installed.Score: 3/5 Prev Page 6 of 11 Next Prev Page 6 of 11 Next. Web AntivirusRussian antivirus firm Dr. Web provides a free online file and website scanning tool that allows users to quickly check if a particular file, archive, or download URL is infected. Select individual files or archive them, and then upload to Dr.

Web, which will based on the company's database of known viruses and malware. You can also send a download link to the Dr. Web service, which will scan the download for known malware.Verdict: While it's not a replacement for a dedicated security suite, Dr. Web's online file checker gives you an extra layer of security, allowing you to check files being shared or linked to you before clicking on the download.Score: 4/5 Prev Page 7 of 11 Next Prev Page 7 of 11 Next.

AVG Online Web Page ScannerAVG's Online Web Page Scanner allows you to input links and website URLs in order to scan the addresses for suspicious code or downloads. A simple drag and drop utility, AVG Online Web Page Scanner displays the results of the scan, as well as any threats reported by other AVG users who have previously accessed that site.Verdict: While too tedious to use with every link out there, you can use this tool to check on suspicious or innocuous links received out of the blue from friends and contacts. It's not infallible, but again, adds extra protection to your internet use.Score: 3.5/5 Prev Page 8 of 11 Next Prev Page 8 of 11 Next. BitdefenderBitdefender also provides an on-demand, free online that can be quickly run through your browser. Essentially a cloud antivirus scanner, Bitdefender's free scanner operates through a browser extension, and is a fast-working scanner that checks for malware and viruses active in your memory or within your startup files. While this should detect many infections, it's not as thorough as a true deep scan.Verdict: Somewhat superfluous if you already have antivirus, but it is a very quick on-demand scanner.Score: 3.5/5 Prev Page 9 of 11 Next Prev Page 9 of 11 Next.

JottiJotti is an online service that allows you to scan a file for viruses and malware. What makes it different is that instead of using just one antivirus scanner, it sends them out to several different antivirus companies and then tells you whether or not any of the companies classified the file infected. While there is a 25 MB file limit and uploading the file and waiting for it to process might take a bit more time than a single dedicated scanner, Jotti is an interesting way to get second, third, and futher opinions about a particular file. Got your hands on a new piece of software that your AV says is malware? Check it out with Jotti. As a bonus, anything uploaded to Jotti is shared with the security community so every infected file or false positive you upload helps refine some of the most popular antivirus tools out there.Verdict: An aggregate virus scanner for single files and executables, Jotti is an excellent way to get additional opinions on files that may or may not be false positives.Score: 4/5 Prev Page 10 of 11 Next Prev Page 10 of 11 Next.

Checkit Software

VirusTotalVirusTotal, acquired last year by Google, provides a free aggregate virus and malware scan, not only for files, but also for URLs. Intended primarily for the quick scanning of suspicious downloads and URLs, Virustotal allows you to upload files of up to 32 MB, or input URLs.

Speedier than Jotti, Virustotal remembers when a particular version of a file or site has already been uploaded and scanned, making for faster verdicts on a certain files or links. Anything uploaded to VirusTotal is also shared to the computer security community.Verdict: An online file and URL scanner tool on steroids, VirusTotal allows you to quickly assess suspicious downloads or links. It will not replace your primary antivirus tool, but it should help confirm or negate false positives, providing you with feedback from a battery of different.Score: 4.5/5 Prev Page 11 of 11 Next Prev Page 11 of 11 Next.