Troubleshoot:Computer is unable to restart without hanging during the process. Error

Computer is unable to restart without hanging during the process.

I have Windows 7 running on a HP Pavillion notebook.  Lately, besides freezing up for no apparent reason and very slow response time, when I click on "restart" -  9 out of 10 times when it goes to "log off" it will freeze the machine with the spinning
circle.  I have used log off - log on and shut down with success.  It only seems to happen with "restart."  Net result is using the on/off button to shutdown and then power back on.   This give the usual wrong shutdown message and attendant suggests/menu. 
I've recovered the system to an earlier time but the problem remains, even in safe mode.  Any ideas?  Thank you.
original title: Restart computer freeze

Anwsers to the Problem Computer is unable to restart without hanging during the process.

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If you have the same behaviour in Safe Mode it sounds like it may be a Windows problem or, worse still, an expensive type of hardware fault problem.
 
Have you tried running the System File Checker program?
 
How to repair the operating system and how to restore the operating system configuration to an earlier point in time in Windows Vista (or 7)
http://support.microsoft.com/kb/936212/#appliesto
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7
http://support.microsoft.com/kb/929833
How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program generates in Windows Vista
http://support.microsoft.com/kb/928228#appliesto
 
Have you tried testing with another Windows user?
 
Try running ChkDsk to check your drive for errors.
Right-click your Drive icon/ Properties/ Tools/ Error Checking.  Try it first by not checking either box (this will run it in a Read-only mode) to see if it flags any hard drive or file problems.  If it
does, restart  it by ticking both boxes, and rerun it to allow it to attempt to fix any found problems.

See how many unsigned drivers you have running on your machine.  This article will guide you on the instructions but all you have to do is type sigverif in Start Run.
How to identify unsigned drivers using sigverif utility in Windows Vista or 7.
http://www.winvistaclub.com/f34.html
 
 
You could try saving your valuable data and reinstalling Windows.

Make Sure that your System Meets the System Requirements

You need to double-check your computer's hardware configuration against the following Microsoft requirements. If your computer hardware is not up to par, then make sure you update where necessary before continuing:

Microsoft Windows Requirements :

• 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
• 16 GB available hard disk space (32-bit) or 20 GB (64-bit)

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