system
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My experience is that malware loves to hide in XP restore points.
Best software I have found to date to remove that malware is the free version of Emsisoft AntiMalware. Run a full scan or minimally the drive when the restore archives are located and it will zap anything found there. Once removed by AntiMalware, I have never has it return assuming you are running a good AV. Of course if you restore from that cleaned archive, things might be a bit hosed …
BTW - IE9 is not an option for WIN XP; only IE8.