yrana2002 said:If you have enabled "Clear Page file while Shutting Down" by some kind of tweaking program, it may take a long time for the computer to clear the file.
Check whether it is enabled or not on your system. Search the Windows Tips/Tricks in either Tutorials section or FAQ section to see how to do it.
If you are able to shutdown PC successfully in Safe Mode, then it means some driver may be not able to unload in Normal Mode.