parallels start problem--urgent help

I have installed Parallels Desktop for Mac , but now I got one problem that I can not start it . When I press start button, it is showing the message "Virtual machine cannot be started because of the following problem:

Parallels Desktop is unable to access the virtual hard disk image file /Users/Diana/Documents/Parallels/Microsoft Windows Vista/winvista.hdd. The file is used by other application."

Can anyone help and teach me to solve this problem as soon as possible step by step, because I am using this PC for my company and i have stopped for everything at the moment.

Thanks

 

Hello,

Please follow the article given below in regards to the issue:

http://kb.parallels.com/4680

Thank You.
_________
Anupama
Parallels Team