Hey all, just built a new computer using my old HD, graphics card, and CD drive, installing them onto a new MB with a new PS and fan. I believe I am now experiencing some driver problems, but I am not sure what the problem is, so if anyone could please help clarify to solve this issue I would be much obliged. Occasionally receiving the following error during start-up: "CMOS Checksum Bad. Press F2 to run setup. Press F1 to load default values." I always choose to load the default values and it seems to start fine. However occasionally the computer will load with the sound choppy and breaking. On top of that I appear to be having some general stability problems: IE hangs frequently, other applications occasionally hang, sound is choppy and cut-out with certain games. I've gone through Device Manager and made sure all of my sound and video components had updated drivers. The new MB did come with a driver CD, but I was never prompted for it at any time during Windows XP installation, and I've only installed the sound and video drivers from it. Am I right in assuming the MB could not operate if it did not have the proper driver to begin with? How do I make sure all of my drivers are correct and most-recently updated? I went to the manufacturer's website for my graphics card and installed the most recent driver, not sure if it made any difference though. Also: how do I find out if I am using 32-bit or 64-bit Windows XP? It doesn't list this under "System" in control panel. And I need to know before I install any more drivers as they all specify whether to use 32 or 64-bit versions. Thanks in advance for you help.