For the last two weeks I've been getting this stupid MSN search screen and when I type my search in the box I'm taken to a website called (I let my friend 'borrow' my computer *brilliant*). I've tried Ad Aware, Spy Doctor and Spy Bot and all these programs find all kinds of 'problems' but nothing is getting rid of AARGGH

Has anyone else ever had this problem or any suggestions to fix it? I'm at my wits end.