mouse freezes

Basically, I mention my video card as the screen refuses to update itself, so if I scroll down, it still shows the top of the web page, and then bits of it appear, and then it unfreezes and scrolls down, or If i'm watching a video a pink hue will appear, and then go all blurry. and the sound will be jittery, according to VLC

"frame (computer too slow ?)
ffmpeg: more than 5 seconds of late video -> dropping frame (computer too slow ?)
"i'll have dropped frames."

it's incredibly frustating, and one more thing when i turn on my pc the apple bootloader goes on, and the screen goes amber. and deosn't load the desktop, i have to restart twice before I get to the desktop.

Here's what System Profiler says about my system:

Graphics by NVIDIA:

  Chipset Model:    Graphics by NVIDIA
  Type:    Display
  Bus:    PCIe
  PCIe Lane Width:    x16
  VRAM (Total):    1024 MB
  Vendor:    NVIDIA (0x10de)
  Device ID:    0x0140
  Revision ID:    0x00a2
  ROM Revision:    NVinject 0.2.1
  Displays:
Display Connector:
  Status:    No display connected
P223W:
  Resolution:    1680 x 1050 @ 60 Hz
  Depth:    32-bit Color
  Core Image:    Hardware Accelerated
  Main Display:    Yes
  Mirror:    Off
  Online:    Yes
  Quartz Extreme:    Supported
  Rotation:    Supported
  QuartzGL:    Supported

I mean I'm guessing it's the video card driver, I'm not sure though, any ideas? It's a Geforce 6600GT.

A few things, first thanks for all the advice,

secondly, the logitech mouse is an optical USB mouse.

thirdly, the VRAM in sys prefs, is clearly wrong, it's 128MB for Geforce 6600GT.

But more to the problem, I mean the amber light on my monitor when not starting up, what's that about? the odd freezes when I'm running a web browser and maybe itunes, sometimes not even that.

  Processor Name:    AMD Athlon(tm) 64 Processor 3000+
  Processor Speed:    1.8 GHz
 NFORCE 4 Ultra Motherboard, 1GB RAM, IDE: DVD -RW, CD -RW, 40GB HD (start up disk), 80GB, SATA: 300GB HD, 500GB HD.

USB-PS/2 Optical Mouse:

  Product ID:    0xc03e
  Vendor ID:    0x046d  (Logitech Inc.)
  Version:    20.00
  Speed:    Up to 1.5 Mb/sec
  Manufacturer:    Logitech
  Location ID:    0x02800000
  Current Available (mA):    500
  Current Required (mA):    98 

Another thing, I have a similar issue to the duel core bug, in fact I'm pretty sure it's the same bug, minus the another core, as my mouse freezes up for a short period of time, and then audio stutters.

one more thing, my PC has a kernel panic when I restart/shutdown.

so does your mouse freeze but the rest of your system still works i.e. you can use keyboard shortcuts and stuff? if this happens only during browsing the web or downloading things it is probably a problem with your LAN card not having the right drivers. this happened to me as well on my old system

You haven't mentioned what video drivers you're using? Also, what does System Profiler say about your graphics? hardware accelerated?

If you want to try the drivers from my Nvidia system, you can get them here (media fire.com/?tvngmo0udyu)

If you do try them make sure you back up your current files just in case anything goes wrong

sudo -s
tar -cjpvf /System/Library/Extensions.tar.bz2 /System/Library/Extensions/
tar -cjpvf /System/Library/Frameworks/OpenGL.tar.bz2 /System/Library/Frameworks/OpenGL.framework/
exit

Also make sure to delete any video drivers you might have installed - natit, nvinject, etc - from your Extensions folder.

Assuming you downloaded and extracted the file in your Downloads folder you can do

cd ~/Downloads/nvidia_video
sudo -s
chown -R 0:0 *
chmod -R 644 *
cp -Rpf Extensions/* /System/Library/Extensions/
cp -Rf OpenGL.framework /System/Library/Frameworks/
rm -rf /System/Library/Caches
rm -rf /System/Library/Extensions/Caches
kextcache -a i386 -m /System/Library/Extensions.mkext /System/Library/Extensions/

Reboot, if you have any problems or if it doesn't help, you can boot with -s and recover your previous setup with

cd /System/Library/
rm -rf Caches Extensions Extensions.mkext
tar -xvf Extensions.tar.bz2
kextcache -a i386 -m Extensions.mkext Extensions/
cd Frameworks/
rm -rf OpenGL.framework
tar -xvf OpenGL.tar.bz2
reboot

According to that everything looks good, except I'm having a hard time buying this part

VRAM (Total):    1024 MB

on a 6600? really? wow...

Why don't you give the files I linked to a try. Like I said if it doesn't work for you, no biggie, just recover your old files.

Plz add your system specs in the signature. If you have an AMD multicore cpu it sounds like the Dual-Core-bug, but this problem should be solved with the new kernels. If you're using a logitech mouse watch where the receiver is placed. Don't put it on metal, maybe turn it a bit around, this can help. Are you using two mice at the same time?