Ever since I installed Parallels 6 I've been getting a BSOD in my XP virtual machine after about 5 minutes. The message is "A problem has been detected and Windows has been shut down to prevent damage to your computer. An attempt was made to execute non-executable memory". In an attempt to fix it I upgraded to Parallels 7 but the same thing happens. Besides deleting my virtual machine and re-installing Windows is there anything I can do?