Texture loading problems

Hey guys! I have a bit of a problem here. Every game I run has the same problem since I've played GTA IV Episodes From Liberty City for the last time. The problem persists even after rebooting the system or re-installing windows with the parallel formating of the disk.
The problem is the following: when getting close to a low resolution texture, it loads, when walking away from it, it will turn into a low resolution texture again. Not only that, but grass in some games like Just Cause 2, appears at a visible range, making it beyond all bearing.
My CPU:
-AMD Phenom X4 950 black edition
-ATI HD 4670 1 GB ram DDR3
-Kingston 1GB x2 (i think kingston is the brand)
-ASUS M4a78

ANY IDEAS??? :S
Thank you very much for at least reading this thread, but please do not reply saying: do you have your drivers up to date??? Cause that's like saying: "have you tried turning it off and on again?" XD
 
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