Today my computer crashed (I think I have some problems with its memory) when I was using a Virtual Machine on it. When I rebooted it and opened VMWare my virtual machine had dissappeared. I tried to open the .vmx file but VMWare always said that it was in use and it was impossible to open. I was quite desesperated so I decided to delete the .lck folders next to the .vmx file, and Voila, It worked!!!!
I hope this info help anybody else.