I've been running XP Pro for a few weeks now on my C2D MacBook. Recently, it's been locking up for 2-15 seconds at a time. If any processes are going on in the background, they appear unaffected. However, if any audio is playing, it makes that obnoxious stuttering sound, as a scratched CD might in a CD player. I tried the repair routine off the CD, but that changed nothing. I'm not a Windows guy, but sometimes I need it for school, so it does need to work. Any suggestions appreciated.