problems with graphics and power

Lack

Honorable
May 1, 2013
6
0
10,510
My problem is that i have visual artifacts on the screen and my monitor enters power saving mode, when i have installed on nvidia geforce graphics driver and use some applications like windows media player with the alchemy option. Also, when i try to play certain games that consume more RAM, my mouse pointer and everything else is very slow.
Here's a list of what i've tried to do:
1. Clean install with different OS.
2. Search for GPU and apply thermal paste, but i found a similiar thing on my motherboard, which had a black cover on it and said Intel, so for safety i didn't do it.
3. Set all settings to never in power management.
4. Try different graphics cables.
5. Try another PSU cable.
6. Try another monitor.
7. Rearrange RAM, use less and different RAM.
8. Reset video card.
9. Clean all dust.
10. Reset BIOS with the battery.
System information-
PSU: ATX 230V
Video card: Nvidia Geforce 7300 GT
Processor: Intel Pentium D CPU 2.80GHz
RAM: 2,5GB(Dual)
OS: Windows XP
CPU temperature: 49 degrees
Fan speed: 2200RPM