Windows file (probably mup.sys) damaged or corrupted. Suspect virus may have done this. If it will not boot to safe mode, then your only real option is to carry out a system repair by inserting the O.S. Cd and at the stage where it looks for a previous installation of windows, carry out the repair, (do not repair at the recovery console stage, wait until the prompt to install windows at the stage mentioned above comes up.)
Once you have it (hopefully) running, then download a command line scanner such as DRWEB and run it in safe mode to remove any memory resident viruses that may be present. I also suggest that you disable sys restore prior to running the scanner to be on the safe side. After any infection is removed, re-apply the system restore.
You can also install another hard drive and install windows on that then the old hard drive as slave and scan it from the newly installed drive. That way you can pull off any important files if needed.
If you have password protected your User account on your Windows XP system and can't remember the password(s) to Login. Whenever Windows XP is installed on a system, it creates a default account called "Administrator" and by default this account is not password protected. Therefore, if you bought a brand name computer (such as Dell, HP, Compaq or Sony)or you have installed Windows XP yourself. You should be able to Login to the computer through the Admin account.
Method One
Reboot your machine.
Press F8 before the Windows boot screen appears. Do not press F5 as used on the NT/9x ser of Windows. You will be be prompted with a boot options menu.
Select the Start Windows in Safe Mode option.
Click through several self-explanatory screens until your reach the familiar 'Welcome' screen.
Note that this welcome screen is limited to 256 colors and 640x480 resolution because the primary graphics will have been set to the Windows Safe Mode software VGA adapter. You will not be able to change this mode even in Display options, while Windows is running in Safe Mode.
Find the icon for the Administrator user. If the default settings of your system haven't been changed, there should be no password for this account.
The Safe Mode Welcome screen might display some of the other users on your system.
Login as the admin.
Press Yes at the prompt asking if you would like to continue using Safe Mode.
Continue on to the User Settings control panel. Here you can change any of the other passwords for user on the machine. Make any changes you want.
Reboot your computer. As long as you don't press any keys (e.g. F8) during the boot-up the computer will startup normally.
Login as the user for which you set the password.
If the above doesn
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