I don't know, that's a toughy. Have you tried formatting that USB drive and starting anew with a larger thumbdrive? This is one reason why I don't use XP's system restore feature and disable it totally. To me it's worthless. I go with ERUNT and sfc /scannow for my system restore needs, along with a monthly patch Tuesday 'System Data state' backup using Windows' tried and true old Backup utility. Oh, and installing Windows Recovery Console with full rights helps also.
Edited by Zootopia3000, 28 March 2012 - 03:15 AM.