Avast Free Antivirus
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Full user review
"It works with Windows XP (x64)"
It works. No bloatware. Always up to date. It's free!
None so far.
I was using ZoneAlarm Extreme when I contracted a virus that made my boot drive useless. I decided to re-format with Windows XP, 64-bit edition. To my disgust, I found that ZoneAlarm does not work with this version of Windows. So, I tried Avast Free, which does work with 64-bit versions of Window. So far, Avast has worked flawlessly.