Problems after installing Windows 7

Make sure your speakers are plugged into the right port. win 7 should have installed your drivers. If you are using a seperate sound card and your win7 is a 64 bit system make sure the card is not 32 bit as 64 will not run 32 bit drivers.
 
Well if you happen to have a motherboard that does not support Win 7 you should try installing the motherboard's driver into "troubleshoot compatibility" or check your motherboard's website for an updated driver for Win 7