I am using win xp as VM with mac os . I am using parallel 4.0.3540 . It was working fine for some days is giving issue that when I use to start VM , I am getting message which is attached . As per solution which I have found in forum, I just tried by switching image disk & boot disk , then started VM , windows boots. I can log in but after this parallel tools starts installtion . This gives error " unable to install parallel tools " Please suggest - Rahul