Computer Locks up when "extend these displays" is applied

Computer Locks up when "extend these displays" is applied

I just upgraded to Windows 7 from XP and am experancing a strange issue when trying to set displays to extended.
 I have 2 unmatched monitors (1)Dell 23 inch and a (1) Generic 42 inch LCD display.
 I am able to mirror the displays without problem
but when I set displays to extended and apply my screen goes black (it still has signal) for aprox 15 seconds then my desptop comes back up on my primary display for 3 seconds then the screen goes black again (with signal) then my computer locks up and I am
forced to hold the power button down to reset and reboot into low res mode.
 If i don't reboot into low res mode the problem repeats itself when windows starts.
 My video card is a MSI Nvidia Gforce 8800GT.

Keys to the Problem Computer Locks up when "extend these displays" is applied

Download SmartPCFixer to Fix It (Free)

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 PC hardware is not up to par, then make sure you upgrade 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)

Recommended Method to Repair the Problem: Computer Locks up when "extend these displays" is applied:

How to Fix Computer Locks up when "extend these displays" is applied with SmartPCFixer?

1. Download Error Fixer . Install it on your system.  Click Scan, and it will perform a scan for your computer. The junk files will be shown in the scan result.

2. After the scan is done, you can see the errors and problems which need to be fixed.

3. When the Fixing part is finished, your computer has been speeded up and the errors have been fixed

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