SUPERAntiSpyware free (on demand only) works great on both of my XP machines with no problems. I use avast! on both. On one I have the patch Tuesday Special (ZA Antispyware [includes ZA Pro fw]), on the other I use Spyware Terminator & PC Tools fw+. No problems or conflicts. ;D

Scans with SUPERAntiSpyware free confirm ZA Antispyware & Spyware Terminator are doing a superb job on my machines by finding nothing. ;D

Scans with ESET’s online scanner (NOD32) confirm avast! is doing a great job by finding nothing. ;D