What you have on your pc in terms of security should be related to your surfing/downloading habits and how much you value your setup & data. The more risky u are, the more you should invest in the right s/w.
Though as a must, having a firewall is critical (even if it is the xp one). And an anti-virus is needed these days.
In terms of progs that I've used:
anti-virus: nod32
firewall: Look n Stop (seriously lean but not easy to configure, though the best for preventing any trojans from connecting to the internet). Also use a wireless connection which has a built in h/w router & NAT/SPI f/w. This means that the s/w f/w is hardly impacted in from the outside, and uses even less resources
TDS-3: the best anti-trojan
Registry cleaner: Regsupreme Pro
Disk defragmenter: Perfect Disk (superb)
Anti-spyware: spybot & Ad-Aware; PrevX Home (free)
Cleanup: Crapcleaner (free)
As u can see, I'm a bit paranoid
If you set most s/w as scan on demand (but not your AV), then you don't use too much system resources.
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