Sounds like you have spyware on that comp. There are certain IE plugins that install themselfs that link certain words to advertisement pages. Get Hitman Pro 2.0, that will prolly get rid of it.
It could also actually be Microsofts own doing. They have a thing called Smart Tags that automatically turn certain words into links. It generates them money... somehow. I'm fairly sure you should be able to turn it off somehow.
Try searching for Smart Tags or MSSmartTags on the Internet.
“Also, we don't need no Jacob to gay this place up. We have officially won the award for the forum with a highest proportion of gay members whilst not being themed about poojabbing, cowboys or Kylie.” - Nate