I have checked on the internet and could find nothing that didn't cost at least 30 dollars. Could anyone reccommend a program?

Currently I can get it past the initial login but then explorer freezes and my task manager has been completely disabled (not to mention that it would screw it up if I even tried taking it off the process list.)

IFFF I get the computer started its just bam pop up after popup and its completely screwing my computer up with background tasks. Will I have to reformat my disk or?