Flash playback is incredibly choppy.

Hey guys,

For the last few months now I find that streaming videos online can be quite an irritating process. I've been googling the issue for weeks and have not been able to find a goof fix for it. Basically streaming flash videos online can be supper choppy for me and can cause my entire browser to lag up.

When streaming youtube videos it works fine most of the time, unless of course I watch them in HD, which is when it'll most likely start spazzing out on me, and also when I stream videos off blip.tv it's incredibly laggy as well. I've never had this problem before and it only really started after I did a clean re-install of Vista a few months ago. All my drivers are up to date and I've tried uninstalling and re-installing Adobe Flash 10 multiple times.

Any sort of help would be greatly appreciated, here are my PC specs if you need to know them:

Windows Vista Home Premium 64-Bit (Service Pack 2)
Intel Core2 Duo T5750 @ 2.00GHz
4.0GB RAM
Graphics Card: ATI Radeon HD 2600


Quicktime video also works flawlessly and my PC games run without a hitch.

Thanks again in advance!
-Paul