- Jul 13, 2001
- 2,931
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Does anyone know what significance this file has to operating Windows XP? I went to go open up Photoshop last night and my computer froze on me. I hit the reset button after I realized a CRTL+ALT+DEL wasn't going to do any help for me. Now the computer won't start regularly and hangs up on the "mup.sys" when trying to start in safe mode. Does anyone have any suggestions and does the Windows XP CD have a repair OS option?