Display driver errors - IDs 1, 4101

I've been having weird errors with my computer in the past month, and I can't seem to find the reason behind it..

Log Name: Application
Source: NVIDIA OpenGL Driver
Date: 3/31/2011 9:48:12 AM
Event ID: 1
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Description:
Too many errors occurred, which indicates a serious problem
from which we cannot recover. The application must close.

Please visit http://www.nvidia.com/page/support.html for help.
Error code: 2
Event Xml:

1
2
0
0x80000000000000

9506
Application
Adam-PC

Too many errors occurred, which indicates a serious problem
from which we cannot recover. The application must close.

Please visit http://www.nvidia.com/page/support.html for help.
Error code: 2

Log Name: System
Source: Display
Date: 4/13/2011 10:32:22 AM
Event ID: 4101
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Description:
Display driver nvlddmkm stopped responding and has successfully recovered.
Event Xml:

4101
3
0
0x80000000000000

23227
System
Adam-PC

nvlddmkm

These are the main stars, but i've also had some PNRPSvc and Service Control Manager (IDs 102, 7001, 7023) that i've been able to get rid of with some googling.
These 2 errors though, turn my screen black for 1-2 seconds, and then everything goes back to normal, and i get the pop-up message in the task bar about the display driver stopping and recovering.
the weird thing is- everyone who posted these errors online reported it happening on specific apps (games or the like), while mine are few and far in between, and ALWAYS when the PC is just idling (either when i'm away and i find out about it in the event log, or when i'm just browsing the web), so i'm inclined to say it's not anything related to the GPU/PSU getting too hot/loaded, as some people have mentioned this to be.

I did experience a lot of those when i first installed the 266.58 drivers, then reverted to the older ones, then back to 266.58 a month or so ago, and up until now no errors..

i also reverted any component OCing back to stock about 2 weeks ago, just in case it is from ram oc'ing or the like, so that shouldn't be it either. temps are always low in both stock and OC (running evga precision and amd overdrive constantly - gpu 30-60, cpu 20-28 on all cores).

ideas anyone?