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Below are the links to the best available online scanners that search for spyware and viruses on a computer the scanners are run from. They use ActiveXs/plugins in order to access the computer’s file system, so they need to be allowed to be loaded by the computer firewall and/or by other antispyware/antivirus program running on the computer.

• Symantec (Norton) Security Scan
• Kaspersky Online Virus Scanner
• McAfee Antivirus FreeScan
• ESET Online Antivirus Scanner
• F-Secure Online Scanner

Once again, the tools above are the best online antivirus tools available on the Internet. All of them belong to the companies that produce the reliable antivirus and firewall software. Online scanners are fine for one-off computer check if there’s a suspicion that a computer is infected with the virus or the spyware but personally I wouldn’t encourage anyone to use these tools all the time. If someone is worried about their computer security, they should install the special software to protect their computer from the malicious programs. Remember to install only one antivirus that protects the computer all the time because if two are installed and are running, they will clash and the operating system may not work properly.
Other security programs may be installed but only to scan the computer once or manually on demand instead of being permanently run on the background. This is where online security checks come in handy - in their cases the hard drive space hungry program installs are not required and possible configuration changes and uninstalls are not required as well.
Note that some of the above tools work only in Internet Explorer.