I've been using Vista,XP, and XP64 on my laptop and the only one that's ever crashed is the XP installation- The vista installation has been running smooth as butter for the last few weeks without a reboot, constant sleep/wakeup cycles, etc. Whereas the XP installs both grind to a halt upon resuming, CPU refuses to go back to top speed of 2.0Ghz and sits around it's sleep speed of 16Mhz. NOT fun to even try to shut it down.... Sound suffers... ugh, it's terrible...