Spybot is a joke. Please take a minute to download Speccy. It will give you full details on your pc. What are you running for a firewall and what is your OS? System slow downs are usally related to something eating up all your ram or cpu. You can also use Process Hacker to see which program is using up all your ram. How many start up items do you have?

http://processhacker.sourceforge.net/

http://www.piriform.com/speccy