It doesn't matter if you have an ATI or NVDIA, it works for all and fixes all. Yeah finally I got rid of the problem, and I found it here on the forums and some win7 forums on what was causing it.
First you can start by reading some more here :
http://msdn.microsoft.com/en-us/windows/hardware/gg487368.aspx
That's one of the causes, but now the EASY FIX. (without reinstalling windows !)
Following programs needed :
Display drivers : Download on your brand's support page the latest video drivers first.
CCcleaner : free version can be found here :
http://www.filehippo.com/download_ccleaner
1. open your control panel, programs, uninstall program, and UNINSTALL NVIDIA display drivers.
2. reboot your computer, upon start windows will install an older driver for you video card, just let it be.
3. Start CCcleaner and let it run. It will clean a lot of registry entries that are absolete.
4. Uninstall the video drivers again windows just installed (trough device manager or programs/uninstall)
5. reboot your computer in SAFE MODE (else windows will upon start reinstall some drivers by itself)
(safe mode by pressing F8 on start)
6. now in SAFE mode , install the drivers from your brand/model.
7 reboot normal
You're done!
I've successfully tested this for over a week now, ran a lot of applications and games together to stress it to the max , and the problem has not occured.
Meanwhile I would still URGE TOSHIBA to release a newly updated proofed display driver. It has been long enough, won't you think ?
Regards