You can test and see...
Run it once with Norton, and then without it:
http://us.mcafee.com/root/speedometer.asp?cid=9438
Mcafee isn't always good with these tests..there are others to..
http://www.dslreports.com/stest
http://www.bandwidthplace.com/speedtest/
http://msn-cnet.com.com/7009-7254_7...ubj=speed&part=msn-cnet&tag=speed&kbps=2749.3
Run it once with Norton, and then without it:
http://us.mcafee.com/root/speedometer.asp?cid=9438
Mcafee isn't always good with these tests..there are others to..
http://www.dslreports.com/stest
http://www.bandwidthplace.com/speedtest/
http://msn-cnet.com.com/7009-7254_7...ubj=speed&part=msn-cnet&tag=speed&kbps=2749.3