Computer Hangs almost immediately after Windows 7 boot up [Solved]

Computer Hangs almost immediately after Windows 7 boot up

I have a Dell Dimension E520 that was originally running Windows Vista but which was upgraded (without any problems) to Windows 7 Ultimate when it was originally released

Since yesterday, when trying to boot up the machine, it has 'frozen' - initially at the 'Welcome' Screen but after trying a
Startup Repair it now boots to the desktop before freezing.

I also tried a System restore via the Win7 cd, which Windows said was successful and now every time I boot the machine, I get the 'System restore successful' message - and a few seconds later the machine locks up.

It also locks up if I try accessing the machine via safe mode.

Does anyone have any ideas how I could fix this problem and/or what could be wrong..?

I would try a repair install but my machine doesn't stay 'alive' long enough and I probably need to delete some files before I had enough free space..

Thanks

Anwsers to the Problem Computer Hangs almost immediately after Windows 7 boot up

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Manually editing the Windows registry to fix Error Computer Hangs almost immediately after Windows 7 boot up

Caution: Unless you an advanced PC user, we DO NOT recommend editing the Windows registry manually. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. We do not guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

• Click the Start button.
• Type "command" in the search box... DO NOT hit ENTER yet!
• While holding CTRL-Shift on your keyboard, hit ENTER.
• You will be prompted with a permission dialog box.
• Click Yes.
• A black box will open with a blinking cursor.
• Type "regedit" and hit ENTER.
• In the Registry Editor, select the Error 0x9C-related key (eg. Windows Operating System) you want to back up.
• From the File menu, choose Export.
• In the Save In list, select the folder where you want to save the Windows Operating System backup key.
• In the File Name box, type a name for your backup file, such as "Windows Operating System Backup".
• In the Export Range box, be sure that "Selected branch" is selected.
• Click Save.
• The file is then saved with a .reg file extension.
• You now have a backup of your MACHINE_CHECK_EXCEPTION-related registry entry.

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