Screen turn black and comes back on 1340

I have a wired problem on my 1340 using windows 7 64bit.
From time to time, not sure when but when Im on windows (desktop, surfing with firefox etc..) the screen suddenly turn black, I dont see anything thou the laptop still runs normally - if I press ctrl + alt + del, I do see the menu that lets me choose all the basic options but when I exits it I still see black. This problem solves itself after a min or two and I see everything back to normal - If I was installing something then the install just finishes (the computer works normally during this, its just the screen). When this problem happens something the screen flickers, I see windows back for a sec and then black again - and after a few times its back to normal.
Anyone knows how to fix this ? Its quite irritating.

1340
P8600
9500M GE
Windows 7 - 64 bit

 

Does this only happen when surfing the net?
When you use FF?
You may try down/up grading your video drivers..

 

no its happening only on windows for now...
I'm pretty sure it happens when I try to install new applications...

 

update:
If I press ctrl + alt + del and press on the Task Manager Option it sometimes fix the problem on goes back to normal screen.

 

i dont understand about "and press on the Task Manager Option"

do you mean ctrl + alt + del and power button ??

 

If you press ctrl + alt + del you get the a screen where you can choose several options, one of them is to open the task manager. sometimes when I do it, it helps get the screen back tho sometimes it does nothing.