Having choppy video from live and buffered online feeds

Hey guys,

I have been having issues with choppy video from any online source for about 2 years now. Anything from disk or HDD is completely fine.

I recently reformatted my operating drive to get a fresh start and have reinstalled windows XP 32bit. Further changes was upgrading from a 7800gt gpu to a powercolor HD 4850 512mb gpu.

I thought the gpu upgrade would cure my issue since the 7800gt did not support hardware acceleration from adobe flash 10+.

I would like to know where to begin looking? I have been seeking assistance and have received lots of ideas for the last few weeks and I am still coming up short.

Any suggestions and requests would be appreciated.

My current Hardware:

WinXP 32bit
DualCore AMD Athlon 64 X2, 2000MHz (10x200) 3800+
DFI nF4 Series MotherBoard
nVIDIA nForce4, AMD Hammer Chipset
2GB DDR2 Ram
HD 4850 512mb video card (new)
nVIDIA MCP04 Audio Adapter
Dual layer DVD reader and writer
200GB C:
320GB H:
500GB Z:
2x500GB Externals

Drivers:
As updated as I believe I can do. The cpu and mobo drivers are verrrrry dated, but seem to be the best I can do.