Locally on a machine? Are you running FS backups as well? If you are doing backups through the hypervisor, CommVault only requests snapshot creation and consolidation through the API so there is no local control on the guest machines.
Hot fix 1977 addresses an issue with system state not deleting VSS which is rectified going forward, you would just need to clear out the previous snapshots.
You can manually delete the VSS Shadows on the system, using the following steps:
1. Open Admin CMD prompt
2. Type 'DiskShadow' to enter the VSS administration prompt
3. Run the command 'delete shadows all'