Where can I find an online anti-virus that doesn't install on your PC?

[hindorffcanty96136]

I've got 5 PCs that I'm trying to use to train disadvantaged young
people. The problem is they are riddled with viruses and a firewall
blocks me from updating them. The people in charge of maintaining the
PCs won't fix them or give me the admin password (Win XP) to let me
install a new or updated antivirus the centre is being shut down in a
few months.

If they were working, I could still do a lot with them, so I've been
looking for a good online virus scan - but they all try to download a
little .exe onto your PC first, and the settings on the PCs won't
allow that.

Suggestions? Solutions? Links?

[Gwern Branwen]

Have you considered just avoiding Windows entirely? If it's not one
thing (viruses), it'll be another. In the long run, you may be better
off just buying 5 el-cheapo USB flash drives*, sticking a compact
Linux on them, and bypass the Windows on the hard drive, going from
there with Mnemosyne/OpenOffice/whatever.

In your case, Windows is only free if your time is worthless...

* LiveCDs would also work, but then you couldn't update stuff like
files unless you used one of the CD-RW-supporting liveCds and your
computers have such drives.

--
gwern