I'm on my Linux OS laptop right now and don't have anything important on it.
I don't know if this problem would even affect a linux based computer haven't searched on that, cause I can just wipe and reinstall if needed.

On my desktop - I am updating
xp from Microsoft
my zone alarm Internet Security suite - changed settings to deep scan and changed a few things to a higher level for awhile.

you might consider changing any settings to a higher level of security if you are comfortable doing it.

possibly turn off computer or lock down Internet when not using it.
you could also turn off your modem when not in use.
one problem with having 2 computers at the same desk is I keep typing or grabbing the wrong mouse or keyboard LOL.