When your PC is slow, it may not always be spyware
problems.
First of all, tell me what protection programs (antivirus, firewall
and anti-spyware) you use?
Next, when is the last time you defrag your hard disk?
Thirdly, how much hard disk space is left?
Fourthly, what is the specs of your PC?
Fifth, which version of Windows are you using?
Lastly, what programs are installed on your PC?