What is a good anti-virus for use with Freespire 2.0? I used to have Linspire 5.0, but I chose Freespire 2.0 over Linspire 6.0.

I downloaded the Aegis Virus Scanner, ranked 403 or so here, and had an unusual experience on first weekend.

How can the source of a file be ascertained, as I think I have only downloaded software?
This weekend I upgraded Linspire 5.0 to Freespire 2.0.3 to continue my
CNR access. After downloading a few programs I ran the freshly
downloaded "Aegis Virus Scan" and learned: v29n50.sys contains the
W32/Netsky.c@MM virus.
This w29n50.sys file is referenced in four files:
ndiswrappers-drivers.list var/lib/dpkg/info
ndiswrappers-drivers.md5sums var/lib/dpkg/info
w29n50.inf etc/ndiswrapper/w29n51/
w29n50.inf lib/windrivers/
It would be nice to know where it came from. It is a bit of a shock, this early.
bt

It seems half thepackages I click on are not available for my new distribution. I was happy with Linspire 5.0, but had to upgrade to keep CNR.

Any suggestions would be helpful, and does anyone recognize w29n50.sys?

bt