Disk space wasn't freed after delete old drivers with DriverStoreExplorer

Apr 14 at 11:25 AM
Driver Store Explorer V0.7.0.0
win10

I deleted several old drivers with Driver Store Explorer ,those drivers disappeared in DriverStore folder but my disk space wasn't freed. After that I deleted a driver by pnputil in CMD and my disk space was successfully freed. What can I do now to get those disk space back?