I have the same issue. I'm doing what I can to update my system so I may livestream (via Twitch) but so far I've hit brick walls. I'm trying one last thing to see if I need to buy extra parts or if I should just invest in a new computer.
As a list, these are the things I've done to try and fix this problem:
Updated my video card
Updated my Windows Vista platform
Updated my DirectX10
Now I'm currently updating my integrated chip to see if that works. If you have any suggestions on what I should do besides this, please respond.