Unable to connect to Hard Disk 1

Hi
After 1 month using parallels, suddenly today I received this message while starting up my virtual machine with windows 7. I don't use bootcamp.
I've read some hints and I've tried to change all the permissions on the .pvm file and all his content with the command

sudo chmod -R 777 ./

but I've already read and write for all files for all accounts.
Il I try to follow this article

http://kb.parallels.com/en/5734

I see that in the parallels.log file I've

04-18 00:58:35.142 F /vdisk:1820:3d17/ Error locking file /Users/paodoc/Documents/Parallels/Windows 71.pvm/Windows 71-0.hdd/Windows 71-0.hdd [35]
04-18 00:58:35.142 F /vdisk:1820:3d17/ Couldn't lock disk: 0x80021037
04-18 00:58:35.142 F /vdisk:1820:3d17/ OpenDisk() returned error 0x80021037

This means it's a permission problem, I think, but permissions are set...

I've tried to copy the .pvm file but I get the error that the file is corrupted.
I've also tried to run a new VM and load the .hdd file as a second HD to save the datas, but I'm always getting an error saying that the file is corrupted or used by another program.

Please I'm desperate... help me

Pao

 

I've noticed that I don't have the DiskDescriptor.xml file in the .psv package... is this the real problem!??!