not knowing what OS ,you are using or the specs of your machine it hard to even start helping !
I do like norton and have 2005 installed but i didn't install it all just the virus scan .no slow down noticed .i install the whole thing on my daughters celeron 600,512 meg ram fresh install of winxp .next program loaded was nNorton ,which i think is the best way to install nortons securitys , no slowdown .
as for the viruses if you are using ME or XP you cold try system restore back to before your fixes .and try another remval tool.
run these free online Virus scan
Be sure to Check off Auto Fix on this site
http://housecall.trendmicro.com/housecall/start_corp.asp
please run this one also to be sure .
http://www.pandasoftware.com/activescan/com/activescan_principal.htm
caperjack
I hate 20 Questions
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