I use Norton Internet Security 2010 on my computer for real time protection. I also own several Antispyware programs that I use for on demand scanning. Would you recommend using another Antispyware program alongside my Norton for extra protection. *Computer speed decrease is NOT a problem. If so, which of these would you recommend the most to use for real time scanning. I own them all already. *Webroot SpySweeper *SpyEmergency *CounterSpy *Ad-Aware Thank you very much!