How are you running BT4 (LiveCD, USB, Vm image, etc)
How about some specs on the hardware you are using
When are you getting this image
Most of us are really good at helping in the forums, but to my knowledge, none of us is a mind reader. If you don't know how to find out any of this information, I would suggest Google for linux commands (lspci, dmesg, etc.....) and searching these very forums for any other information that will help us to help you.