help, windows startup breaks down

hello,

i can run paralles, but when i try to run windows xp on my vm , it breaks down, when i used to be able to work perfectly
anybody knows what might be happening?

 

What is actual error?

 

the actual error is when i run windows in the virtual machine, it starts in
DOS mode and then just shuts down.

 

Screenshot please, or you can perform Windows repair as described in http://kb.parallels.com/en/5138

Backup VM folder first