don't use illegal stuff sharing sites like piratebay.
use a rescue cd like avg's
to scan your system.
look up a guide on how to properly apply thermal paste.
clean up inside your pc with compressed air, clear away any dust. make sure your case fans are pulling in air and pushing it out properly.
try using a different monitoring program like core temp or one from cpuid - hwmonitor
what model is your psu?
may be get an aftermarket cooler if you haven't got one already.