Problem Solved, see below how I got it to work. I did this both for HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER 1. Re-install 911 First Responders to C:\Program Files (x86)\sixteen tons entertainment\Emergency 4 instead of the default directory. 2. Start regedit by selecting Start - Run, typing in 'regedit' and then hitting 'OK'. 3. Select 'HKEY_LOCAL_MACHINE' and press the '+' button to its left to expand the list. 4. Next, select 'SOFTWARE' and press the '+' button to its left to expand the list. 5. Right-click on 'SOFTWARE' and select New > Key. Enter the new key name: sixteen tons entertainment 6. Right-click on 'sixteen tons entertainment' and select New > Key. Enter the new key name: Emergency 4 7. Right-click on 'Emergency 4' and select New > String value. Enter the new key name: Installdir 8. Right-click on 'Installdir' and select Modify. In the 'Value Data' field, C:\Program Files (x86)\sixteen tons entertainment\Emergency 4 Now, exit the registry editor by selecting the File menu and then clicking on Exit. I had to do some trial and error to make it work from this post here . Thanks mercurygrandmarquis1