Nvlddmkm.sys issue, please help.

Registration date
Friday February 1, 2013
Last seen
February 1, 2013
- Feb 1, 2013 at 12:26 PM
So, about 1 month ago I started having this problem suddenly: https://ccm.net/faq/6210-how-to-fix-an-nvlddmkm-sys-error-message
At the beggining I did System Restore and installed new drivers but the problem persisted, then I tried the suggested solution of this site.
It worked. The screen stopped flickering or becoming black but there is another problem now:
I cannot open games, graphic design progams (such as Blender) and cannot view videos in bsplayer (only in other media players).
After some research I found a version of the driver which is susposed to solve this. I could open these progams but they could only crash my computer, so I returned back to my old version.

So, guys do you know any solutions about how to fix it?

(Graphics card: nvidia GeForce 8400M GS)