srnity & TheJazzCafe: There has been a conversation on the Feature Board (until they were asked to take it elsewhere(Computer Board)) last couple of days. Could be linked to the same problem, sounds like Spyware, something called Errorprotector there though & also banner ads that have been showing up.
If you have a decent Virus protector, Firewall and pop up Blocker you should be fine. I know AVG (grisoft.com) do some good free stuff & if you use Firefox you can get an add-on called Add Block Plus.