W7-x64 with jv16PT X build 1495,
There is definitely something wrong with the 'Registry Compactor'.
1. Go to Registry Tools -> click on Registry Compactor -> on the displayed registry screen select ALL hives -> press compact -> error message pops up "Please select at least one item, all previously checked hives are now unchecked.
2. Registry Compactor can not be reused unless jv16PT X is stoped/started.
3. Go to Registry Tools -> click on Registry Compactor -> on the displayed registry screen select any number of hives BUT NOT ALL -> click Compact -> click Start -> error message pops up "Failed to access C:\"
RegCompact1.jpg
RegCompact2.jpg
RegCompact3.jpg