Make the problem editing hard disc properties relating to snapshots go away

Parallels have been aware of this problem for years and this is the solution

1. Locate your Virtual machine in Finder refer KB article http://kb.parallels.com/117333
2. Right click on the *.pvm file of your virtual machine -> choose Show Package Contents
3. In Mac OS X, go to Applications > Utilities and launch Terminal. Type the following but do not execute:
prl_disk_tool merge --hdd
4. Drag the *.hdd file into Terminal and drop it right next to "prl_disk_tool merge --hdd ". In Terminal you will see something like this:
prl_disk_tool merge --hdd /Users/Username/Documents/Parallels/Windows\ 7.pvm/Windows\ 7-0.hdd
Note: There should be a space between '--hdd' and 'Users/Username...'
5. Press Enter/Return key to run the command and merge the snapshots.
6. In the same directory (inside Virtual Machine's bundle) delete Snapshots.xml file
7. Restart your Mac and check with the issue.

I'm sorry but we are users not IT technicians. There is potential in the above to mess up if one makes a misstep