Free online virus and trojan scanners . They do not need to be downloaded or installed, they run from inside your Webbrowser.
Trojan ScannerFreeware online Trojan scanner. This program runs in your browser (Internet Explorer only, Windows), no explicit installation is required.
KasperskyFree online virus scanner and a free scanner to check out a single file.
McAfee's Virusscan OnlineOnline virus scanner by McAffee
Panda Active ScanFfree tool for detecting and eliminating viruses from your computer. Installs as an ActiveX control in your Web browser (Internet Explorer 4.0 or higher).
PC PitstopA large number of online computer and Internet related tests for Windows, including a virus scan and spyware test.
Symantec Security CheckA number of online tests (run in your Web browser), including a virus scan. Internet Explorer 5.0 or higher required.
TrendMicro HouseCallFree virus scanner which runs directly in your Web browser (Windows only).
VirusTotalFreeware online malware scanner. You can upload a single suspicious file which will be scanned by around 30 well-known virus scanners.
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free antivirus