Random computer question i need help with?

Okay, my computer is now gone slow, AGAIN! I scanned for viruses in normal mode but nothing came up apart from ''last result'' And i just highlighted and removed them all, most of them said error occured. But anyway, I scanned for spyware using Spybot search and destroy in Safe mode, and it got most adwares, spyware and PUPS, and also trojans. And i restarted back into normal mode, Computer was running okay after that, then about 2 days after it;s started to go slow again, I had to renew my AVAST! registration key, so i did, so it should be protected. Should i scan for viruses in safe mode? Will that get all the viruses and trojans from the recovery and pavillion drives? Thanks!

Using:

avast! Anti-virus

Spybot search and destroy (updated)

Built in firewall. Activated.

Random computer question i need help with?agv

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Random computer question i need help with?antivirus software

You may not have enough ram, did you defrag? running too many programs, there alot of thing that will slow down your pc. Not just checking for a virus.
Why is my computer slow? I bet you have asked yourself that very question time and time again. And for the most part, you probably just can not figure it out. Ask the guy next to you, and they probably don鈥檛 have the foggiest idea either. I mean, you may get the 鈥渟pyware,virus鈥?answer, but this most likely is not the case.