Shut down the VM, remove the virtual disk from the VM's settings (make note of the SCSI ID and do NOT select delete from disk) and save the settings. Then open the settings again and add an existing virtual disk (GAVMISA.vmdk) to the VM using the same SCSI ID.
Once done, open the datastore browser, create a new sub-directory and move all .vmdk files (except for the one you attached to the VM) as well as the .vmsd file to this folder. Then remove the VM from the inventory by right-clicking it (don't delete from disk) and re-add it by right clicking the VM's .vmx file in the datastore browser to make ESXi aware of the removed .vmsd file (this file contains the information for the snapshots).
If the VM powers on without issues you can delete the backup folder.
André