continious restarting (smode shows right at mup.sys) done rsrch + (solved - must see) playing a game: cs:source suddenly game freezes with a reptitive game sound. no response from keyboard or mouse. held down power key to switch off. turned on later. screen came up with "We apologize for the inconvenience, but windows did not start successfully. etc. etc Safe Mode/ Safe Mode Command Prompt/ Last Known configuration/ Start Windows Normally" ALL options result in restart. with brief Windows Pro splash screen (with logo in middle + meter bar) After two days of research (your forum being one of the first that came up on google) i am still experiencing the same problem. i am aware people have had similiar problem but what i type next should give this a sense of uniqueness which terribly scares me but then deserves its own post. I have performed following attempts at fixing: 1.) Running CHKDSK: Told me Found and Removed errors. As alleged on many websites concerning this issue. - Attempted boot...failed. continued to restart at splash screen (safe mode determines it still at mup.sys) Verdict: Fail. 2.) Plugging out Harddrive (BOTH POWER + IDE Cable slots) / plugging in again. Changing boot order etc. Verdict: Fail. 3.) Running CHKDSK /r: Found and Removed errors. Still failed to load up though. 4.) From Windows Pro CD replacing Kernel32.dll with fresh one. Microsoft alleges that continual restart at mup.sys is due to corrupt kernel32.dll file. ( http://support.microsoft.com/kb/310396/EN-US/ ) however..... Verdict: Fail. 5.) Plugged out all USB devices (read many websites could be problem) Verdict: Fail 6.) Did not recieve XP disc with my computer so borrowed Win XP Pro from friend. changed BIOS boot orde for CD-Rom to load first. Either drive is enabled on start up but regardless the disc inside is not detected. (Not a problem with BIOS. Just the CD is not found when its told to boot up first.) So downloaded the 6 Floppy Disc Boot Up diskette from microsoft. BIOS Boot set to 3 1/2 floppy first. Detected... After painfully exhausting process of loading Setup via Floppy's come to options. If i choose the first Repair (Pressing R on KeyBoard) i can RUN chkdsk and access the XP pro cd via the commands and it is visible by "map" command. HOWEVER. If i choose to "Install Windows XP from setup menu after 6 disc boot diskette. then CHOOSE REPAIR (which repairs - appearing to reformat, keeping all my disc files) im always prompted to "Insert The CD Labelled: Windows XP Professional Service Pack 1 CD" regardless of what cd drive i place it in. I am really worried i will not be able to load up: Computer hardware specs: Windows XP Professional SP1 Pentium 4 2.0 GHz 2 x 40 GB HARDDRIVE Soundblaster Audigy Card ATI Radeon 9250 series Graphics Card Creative DVD Drive (D: ) ASUS QuiTrack DVD/CD-R Drive (E: ) ASRock Motherboard. This is such a vital thing for me as i have music (i am a musician) + inumerable music software on there which is 1/4 backed up (yes my fault - but looking for anti-dote!). I am so not able to handle the calamity of losing the whole drive right now. The Harddrive (C: ) data stands as: 40 GB TOTAL Capacity: 5 GB Spare. The most worrying of all is that Microsoft has seemed to TOTALLY have ignored this issue - such a crash was never part of Win95/ Win98 as far as my knowledge. Have been through Miketechspot.com With no avail. Many forums. Please if a technician could help me considering the failed attempts i would be so grateful if someone posts one solution please post another and do not wait on me for reply - as alternatives in my hands are obviously going to be convienient any knowledge on this error will be appreciated. Seeing my desktop again is now looking like a distant dream....maybe one of you can help me. [due to the unsuccessful chkdsk that supposedly reports a removed error. complete re-installation of windows is not the wisest choice as of yet - as it that failure (of chkdsk) indicates maybe hardware issue) Anyone who has had a similiar problem and reformatted with still persistent problem your knowledge on how you eventualy solved the issue (concerning hardware fix) would be grateful. Any commands for the Repair dos prompt would be appreciated to. thanks peace, AJ.