Hello,
First thing to do is to go to the location where your .vmdk files are stored for that VM and check you don't have any of the following files/folders there:
.vmem file, this contains a backup of the VMs guest main memory and should only exist when the VM is running.
.lck folders, these are locks which are created on vmdks when the VM is running and again shouldn't be there when the VM is powered down.
If you do have any of these when your vm is powered down, delete them and try again.
Let me know how that goes!