Did you create any new vm by use an existing virtual disk with take this disk away option?
I didn't find the Disco virtuale.vmdk in your vm bundle. And I saw you have a vm named Windows 7 x64 2.vmwarevm, but now it gone?
Could you find the Disco virtuale.vmdk by using command in terminal:
sudo find / ''Disco virtuale.vmdk" | grep "Disco virtuale.vmdk"
If you cannot find the file, then someone may accessed your Mac and deleted the vmdk.