I have a windows xp system that seems to be infected with a virus and or spyware. I can't run any of the programs when I try to open up lets say internet explorer I get a pop up asking me what program I want to use to open that with. I also get this is I do msconfig or open word. I can't download anything off the internet , I can't do a system restore and I can't even get into safe mode because I get a blue screen. What can I do?