Hey all, so I recently custom-built a computer with different hardware components, and now I believe I am having driver problems. Occasionally during start-up I receive the following error: "CMOS Checksum Bad. Press F2 to run setup. Press F1 to load default values." I always just press F1 and it starts normally. However Windows XP starts very slowly and sluggishly, the sound very often stutters and slurs depending on current memory usage, and the sound is permanently broken/stuttering with certain games. Also there seems to be general stability issues, certain applications load very slowly, slow to a crawl at sporadic times, etc. Here are my (hopefully) relevant specs: MB: ASRock K8NF4G-VSTA CPU: AMD Sempron Processor 3000+ "Display adapter"/Graphics Card: NVIDIA Galaxy GeForce 8400 GS Monitor: Dell M991 Sound: Realtek High Definition Audio. HD: WD Caviar Blue. WD5000AAKB-00H8A0. If I'm leaving anything else out, just ask.... Obviously the sound driver appears to be the most apparent malfunction here. I've gone to the manufacturer and downloaded drivers off their site for each of these components, I've tried all sorts of different drivers, nothing seems to help.... Any and all advice here would be greatly appreciated. This problem has been plaguing this computer for some time now. Thanks in advance for your help.