I just bought and installed a Radeon HD 6850, but no matter what I do, the driver won't install properly. I've tried removing all old drivers and installing, but it still installs with an error (or warning) and when I click the report, the error field is blank (doesn't tell me what the error is). I have noticed some frame rate issues, plus my sound doesn't really work well. Also, my Catalyst Control panel won't open at all. What can I do to fix this!?