Apparently, while surfing the web, I contracted some kind of spyware/adware that is impervious to all my sweeps. I've tried many different programs, but have been unsuccessful in removing it so far. What it does is it adds a few random pop-ups ( surprise there ), but it also does something more annoying. It changes your starting page to a stupid search-engine, and makes it impossible for you to change the page. Also, it greatly slows the time my computer takes to load web-pages, because it adds links on a few words that take me to the search-engine with the key word in it ( ie : tax, traveling, sex... all these words present on webpages become linked ).
I was wondering if anyone could help me out of this one - short of formatting c, that is.
Edit : Forgot to add that the search engine also replaces the 404 Error page.
Please help - this thing is really irritating

Thanks a lot.