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Does Norton Anti Virus slow a computer down?

I have just looked at a friend's computer which is running  really slow. he has I Gb of Ram and is running Vista Basic . He also has Norton (Symantec) anti-virus firewall etc installed. Is it my imagination or can Norton slow a system down? I have seen other people with Norton and its always the same. I would be grateful for any advice on this and how I can tweak Norton to speed things up.
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Brakers
Asked:
Brakers
3 Solutions
 
wantabe2Commented:
Absolutely! All anti-viruses slow computers down a little but in my opinion, Norton is worst!
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Cobra25Commented:
I agree with wantabe2. Norton is a memory HOG. I recommend AVG, Nod32, or Avira as a/v software.
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John HurstBusiness Consultant (Owner)Commented:
Tell us whether Symantec or Norton (that is, Corporate or Consumer). They are different. I use Symantec Corporate and I disabled the Start Up Scan, and otherwise leave it all intact. My CPU runs at less than 2% more than 95% of the time and runs fast as blazes. .... T
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BrakersAuthor Commented:
Norton Home antivirus 2009
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Cobra25Commented:
The home version is not my cup of tea. If you must use it, i would recommend increasing the amount of RAM in your system.
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BrakersAuthor Commented:
many thanks to all who contributed
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