I have windows 7 ultimate x64 , I need to run some applications that are not compatible with 64 bit OS. I have installed virtual windows and Xp mode but the virtual OS does not startup as it says ,, the "os has been marked read only and most OS cannot run in read only mode"..what should I do someone Pl help me... I've even tried to uncheck the read only box in the xp mode ".vhm" file properties but it doesn't change...