First if your system is infected and you can"t connect to the internet or the spyware is blocking your computer from doing anything go to a friends computer and download these files.
Superantispyware.com
Malwarebytes.org
If you get a windows that says "Open With" everytime you go to start a program, you need to get this file (exefix_xp) and run it on your computer  Get it here


Install them update and run this can take a long time but let it finish it"s thing and then remove what it finds.