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If this just started roll it back by with System Restore. Under Safe Mode (press F8 during boot and choose Safe Mode).
In Win 7 - Start > Start > Search type System Restore.
In XP - Start > All Programs > Accessories > System Restore. Now choose a date prior to problem. You may have to try a few dates.
There is the option of uninstalling last program(s) that was installed, again in safe mode.
You also try disabling startup programs. Go to Start > Run (search in Win 7) and type MSConfig. In Startup tab, uncheck anything that you don't want Windows to load automatically. It will make Windows boot faster and use less resources while running. This just disables them in startup. Programs will still load, but when only you initiate.
You might have installed incompatible drivers. Boot the computer into "Safe Mode" by pressing and holding down the F8 right after pressing the power button to turn PC on. Select "Safe Mode" in the Windows Advanced Boot Options". Icons might look bigger or the screen will look different in Safe Mode. Click Start>All Programs>Accessories>System Tools>System Restore. Use System Restore to restore the computer back to a date when the computer is working fine. The computer will restart during the process.
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.
This may have happened after an update where a driver was updated that microsoft recommended but was the wrong driver turn off automatically download and install updates choose your updates wisely now to fix that driver either try to roll back the driver if you can figure out which one it was even if you have to go to safe mode to do it or try system restore to locate system restore choose start/help and support search for system restore
Try booting into safe mode. If it's a driver problem, safe mode will allow you to start Windows with only the bare minimum of hardware and drivers being engaged. To get to safe mode, press the F8 button on your keyboard during the Windows boot process until it takes you to a screen to let you select Normal, Safe Mode, Safe Mode with networking, etc. I would suggest not using anything other than just Safe Mode. From there, uninstall any software or new drivers that you recently installed. Alternatively, you can use the System Restore feature to rollback to a previous restore point.
try to boot in safe mode thru boot menu pressing F2 or F8 or F10 when prompted on startup it will present u with a screen to select safe
mode on startup just go thru safe mode and try using system restore in
the Start> All programs> accessories>system tools>system
restore try to restore on the earlier date when ur sys was ok see if it
helps pls vote if u think i was helpful
Do you have the original recovery disk? I recommend inserting the recover disk, restart the computer while continually pressing F12. Select boot from CD, press any key when asked, and you would want to do a "repair". That should fix your problem.
Force your computer to start in Safe Mode. To do that, hold down the F5 key when you start up and keep holding it until you see that your PC has booted to Safe Mode. (Another way to do this is to hold down the F8 key during boot time until you’re presented with the Windows Startup Menu and then choose Safe Mode from the list of options presented there.
When you’re in Safe Mode Windows skips the Config.sys and Autoexec.bat files and loads a minimal set of drivers that lets your PC function at a basic level. Then do a systme restore while on safe mode......
Try starting up the computer in safe mode, by pressing F8 at a certain point on startup. If it starts in safe mode do system restore. If you cannot even start in safe mode you will probably need to reinstall windows, you can also try a system recovery, but this does not always work. If you have a boot disk like ultimate boot cd (you can download some from torrent) you can start system restore, or repair system using the boot disk. Easiest way to proceed is probably reinstalling system.