[false alarm] Clamwin portable 0.93 suspected as virus

I have a weird thing with the file ClamWin_Portable_0.93.paf.exe.

Every time I execute it my real time antivirus (ca's etrust 7.1) yells at me that there is a virus at:

c:\documents and settings\[myusename]\local settings\temp\ns[changing number sequence]\system.dll

When I scan (with ca etrust antivirus) the clamwin_portable_0.93.paf.exe file it doesn't detect anything.

I searched the net and there is at least one virus that is known to create this system.dll at the above path and I would have thought that it's not clamwin's fault but that the virus is detecting that I run clamwin so it does something to protect itself BUT when I tried downloading and running the same clamwin file on a different computer running the same antivirus it happened again(real time scanner reports a virus, bla bla bla).

While it is possible that both computers are infected I can hardly believe it. the other computer is turned off most of the time and is connected to the internet via a proxy only.

Could it be a false positive? should clamwin portable setup create some system.dll files in my temp dir? I did see them getting created every time I run clamwinportablesetup.

I'm scanning my windows hard drive right now from my dual booted ubuntu and still nothing was found but I'd love to hear anything that can shed some light on this phenomena.

EDIT:
Another false alarm. the problem was with ca's antivirus for the enterprise vet engine virus definitions 5724 false positiving the installer. with 5725 it seems ok.