NVIDIA driver upgarde - Screen now Blacks out

[sargan]

Was having error "GPU kernel stopped working, successful recovery" As per recommendation I carried upgrade of Nvidia drivers on my Geforce 560TI. (W7 64 bit)
NVIDIA auto selected right driver and I downloaded 331.65

Did a clean install ... it started - then screen went Black ... PC running, just nothing on screen, not crashing - restarted in safe mode and installed again, had successful upgrade message.

PC boots up and key items seem to be working .... but several apps (incl GeoForce own) as soon as I click to run screen goes back ... again no crash just nothing output to monitor.
I went to Device driver to try roll back .... but option is blanked out.

Other upgrades I wanted to apply (ASUS MB chipset etc) I can't as, soon as I start the .exe the screen goes black, so I can't see options to select, etc.

Help ...

 

[sargan]

Further update ...
[FONT=&quot]Carried out a driver clean with 'cleansweep' then a normal install of driver package again.[/FONT]
[FONT=&quot]Installed OK (better than last time) ... and asked to reboot - [/FONT]
[FONT=&quot]1st reboot ... BIOS, then windows splash, then Black screen

Rebooted again - this time got to logon OK ... then as soon as I tried to delete upgrade folder off my desktop ... Black screen

Rebooted again - in safe mode, after completion - shut down, and reboot normally - this time up & OK .... but concerned something still not right. Dev Mngr does say 3165 is the driver ver.[/FONT]
[FONT=&quot]
[/FONT][FONT=&quot]Although browser and email working ....- install puts shortcut on desktop to its "Geforce experience" ... click on that ... screen goes Black .... as before does not crash, but nothing output on screen .... if I click off button, it shuts down correctly.

Display is at correct rez 1680 x 1050 [/FONT]