A couple of system issues alot of people overlook, and the root of alot of system problems are both BIOS versions and chipset drivers.....
You should always make sure that you have downloaded and installed the latest versions based up upon your system. Here is a link to the latest Intel chipset drivers, from here you still need to download the correct driver based upon the chipset on your motherboard.
Intel® Chipsets
http://www.intel.com/design/chipsets/