Joe;
Often times, especially if you have performed, as you've said a custom clean install to Windows 7, it's important that you use either your computer manufacturer's website or specific hardware device manufacturer's websites inorder to make sure that you have all the latest and hopefully Windows 7 compatible drivers for your specific hardware devices (especially things like your BIOS, chipset, graphics card and sound cards, as well as if this is a laptop you may need to install certain proprietary applications unique to the laptop manufacturer). Without having any information regarding your specific computer we can't very well even point you in the right direction. If you can provide some specifics regarding your hardware perhaps we can help further.
And by the way welcome to the forums and thanks for joining.