1. Fusion's Snapshot function can restore your VM to a health status, but it is not available since your vmdk is gone.
2. If you had backed up of your Home folder on Time Machine or somewhare, you can restore/copy VM bundle back.
3. Seems the .vmdk file is deleted by unknown reason, try google this 'undelete files mac os' or 'recovery deleted file mac os.'
and see if it is possible find the vmdk file.
4. If no luck, I think you should consider re-install your Windows VM, and do a back up for you Home folder or VM.