Portable Malware Scanning Software for Win2008

Is there any malware/spyware/virus scanning software that can be run via USB or other means to scan a windows server 2008? It needs to be something that does not need to be installed.

I like ClamWin for this purpose. You can get it here, in handy Portable Apps form. I have had trouble getting this version to update its definitions if I haven’t kept it up-to-date regularly, and that generally requires downloading and installing the latest version from Portable Apps again to fix it. Not that big a deal, though — it’s only an 8MB download. And if you regularly use it/regularly keep its definitions up-to-date, you shouldn’t run into this at all.

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