I installed beta 5 over beta 4 as I had the other betas. Everything booted fine. I think installed Parallels Tools. During the installation process for the mouse I was prompted for a file on the Windows XP CD (which I didn't have with me so I said cancel). The install finished and the VM restarted. My MacBook then had a kernal panic and crashed. Now I get a "invalid boot.ini" error for a split second and a windows erorr about the hal.dll file being corrupt.