I'm running an up-to-date Parallels 4.0 VM on my MacBook with and also up-to-date WinXP OS inside. Over the last couple of months, I've had multiple total crashes of the VM. I just happened again, and it goes through an automatic reboot so it's hard to see the error message. It says something about prl_vadd.dll but I don't have time to read it before the system reboots. I don't believe I"m doing anything to trigger this problem. I haven't noticed that it occurs after a particular sequence of events. I'm only using a single program in XP for data analysis. I'd love any support or advice that anyone has.