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Sounds like spyware, not a virus. How much of an IT guru are you? You can always run adaware or even the windows version of anti-spyware, but if you want to get a real good look, use Hijack This. You have to know what you are looking for with that. It provides a great deal of info.

For starters, download some anti-spyware software and Im sure you will be surprised on how much crap it finds.

Yes it very much sounds like spy ware I would start off by using MS anti spy ware tool which actually works very well it's available at

http://www.microsoft.com/downloads/search.aspx?displaylang=en

Then you can use Spy Bot Search & Destroy but make sure that you do not delete the MS anti spy ware link when you run it. It's available from

http://www.safer-networking.org/en/download/index.html

Or Ad aware which is available from

http://www.download.com/3000-2144-10045910.html?part=69274&subj=dlpage&tag=button

After you install these you'll need to run an update to make sure that they have the latest Spy Ware definitions installed and they should remove most of the offending infections although you may need to run in Safe Mode to get rid of the really nasty ones. If that is the case I would try the MS beta one in Safe Mode first as it works really well and was brought by MS to fill a gap in their product range it will be included as a production version when Vista is released so do not worry about the Beta claim as it only has this until the next version of Windows is released.

Col

Be sure to scan with Spybot at startup. While in regular (or Safe) mode, click Mode--select Advanced mode--Settings--Settings--under System Start tick "Automatically run programs at next system startup". Reboot.

Another possibility is a rootkit. RootkitRevealer is a good product and can be found here http://www.sysinternals.com/Utilities/RootkitRevealer.html

Lastly, since you have more than one machine with the above problem, be certain to check servers for spyware and rootkits.