I have the same problem on Vista 32bit.
Today, about every 10 minutes, Avast alerts about a virus found in:
AppData\Local\Spoon\SANDBOXES\SPOON SANDBOX MANAGER\3.21.0.22\20100828072048781\STUBEXE\@WINDIR@\Microsoft.NET\Framework\v2.0.50727\csc.exe.
Is this a false positive?
Thanks a lot