well... your compiler will dictate what you export to for 32 or 64 bit, that is not a win7 issue
Check BIOS for a way to disable the light on the camera, but I dobut ther are any options there
If USB ports are not working then it means you do not have the correct motherboard drivers. Go to the manufacturer's website and download the correct drivers. If none can be found then try the Vista drivers. Remember to match 32 or 64bit drivers for your OS.
This is one of many reasons not to change the OS for prebuilt computers. You never know what odd problems you are going to run into.