Accounts With Blank Passwords Show Password Protected Again

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This is a Dell Dimension 4600 with XP PRo still with SP1. When I remove all four user's passwords they show cleared; then if I return right back to the Users applet, they show they are password protected again. Did this six times. The password asked for is unknown. Does not affect the "Test" account I created.

So, I'll go for a malware infection but need what cleaning tool to look for besides re-Ghosting the machine. That would be too easy but I am always curious for detailed fixes.



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