the best spyware/adware software available is free, its great to use both
adaware se personal
and
Spybot which are both excellent programs.
Also to help prevent spyware/adware from getting onto the computer aswell as popup windows try
mozilla firefox browser instead of internet explorer. its popular and great and free!
If you use internet explorer its important to use this free software called
spyware blaster that stops bad stuff from getting onto the computer before it has a chance to get on and its also free.