If you experience a problem when re-installing / upgrading the following should fix the problem:
NOTE: The normal warnings about working with the registry apply. Make sure you have a backup / method of recovery - this involves working with permissions on registry keys.
1. Run, Regedit.
2. Open "HKEY_LOCAL_MACHINE\SOFTWARE\QBIK SOFTWARE"
3. Right click on this and edit the Permissions. Make sure that the currently logged in user and "SYSTEM" have full access.
4. Close regedit and re-run the installation.
That should resolve it.