Framerate drops after a minute or so (when I don't move mouse)

Okay this is what is happening - I ran GPU-Z

What I'm doing (watching a streaming movie but this happens in games too)

I ran GPU-Z, when I don't move the mouse and walk away after a bout a minute, my GPU load goes from 2% to 99%. When I jiggle the mouse, the GPU goes back down to 2% and the frame-rate gets better. Also, when this happens, not only does the gpu load go to 99% but the GPU temperature goes from about 66*c to about 82*c (and that's as far as I let the temperature rise before jiggling the mouse). I am baffled. The only thing I haven't done yet is update the bios which hasn't been done since 2008 because I have no blank discs. I just walked away and after no movement of the mouse it does this. ALSO - this crap didn't start happening until I reinstalled windows. Also fan speed goes from 1560-2160 rpm when the problem occurs.

my specs:

System Information
Time of this report: 9/7/2012, 22:50:22
Machine name: DREW-PC
Operating System: Windows 7 Home Premium 32-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120330-1504)
Language: English (Regional Setting: English)
System Manufacturer: NVIDIA
System Model: 132-CK-NF78
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Core(TM)2 Quad CPU Q9450 @ 2.66GHz (4 CPUs), ~2.7GHz
Memory: 4096MB RAM

Display Devices
Card name: NVIDIA GeForce GTX 560 Ti
Manufacturer: NVIDIA
Chip type: GeForce GTX 560 Ti
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_1200&SUBSYS_089810DE&REV_A1
Display Memory: 2129 MB
Dedicated Memory: 978 MB
Shared Memory: 1151 MB
Current Mode: 1920 x 1080 (32 bit) (59Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: E421VL
Monitor Id: VIZ0085
Native Mode: 1920 x 1080(p) (59.934Hz)
Output Type: HD15

also not sure if this will help but here is the GPU-Z log (sorry for the wall of text but you can see when I had these problems).
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