You'll get nearly as many differing opinions as you will responses.
I don't think any security "suite" is a good choice. Use smaller,
less-resource-draining stand-alone products.
I used, and recommended, Norton Antivirus and then Norton Internet
Security, for many years, on Win98, WinNT, Win2K, and WinXP, all without
any significant problems. I had used McAfee prior to that. But it's been
several years since I've been tempted to try McAfee products. Their
quality seemed to take a steep nose-dive after they were acquired by
Network Associates.
However, when my subscription to Symantec's updates for Norton
Internet Security 2002 came up for renewal (at a cost substantially higher
than the preceding year's subscription), I decided to try less expensive
solutions. I downloaded and installed the free version of GriSoft's AVG
(
http://www.grisoft.com/us/us_dwnl_free.php ) and the free version of
Sygate's Personal Firewall (
http://smb.sygate.com/free/default.php ).
Both have proven to be easily installed, easy to use, and quite effective.
Additionally, I was pleasantly surprised to see a small but very
noticeable improvement in my PC's performance, once I'd replaced the
Symantec product.