happened to me too heres the fix i got from the develpoer The Emergency 3 Mod Installer may require a registry entry tweak in order to function correctly. NOTE: Modifying or deleting the wrong registry key may cause serious damage to your Windows installation. If you are uncomfortable, have someone who is more computer savvy do it for you. We will be creating the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\sixteen tons entertainment\Emergency 3 US. Within it we will have the Value name 'Installdir' with the value data '[installation directory]'. Please follow these instructions exactly: 1) Start regedit by selecting Start - Run, typing in 'regedit' and then hitting 'OK'. 2) Select 'HKEY_LOCAL_MACHINE' and press the '+' button to its left to expand the list. 3) 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 3 US 7) Right-click on 'Emergency 3 US' and select New > String value. Enter the new key name: Installdir 8) Right-click on 'Installdir' and select Modify. In the 'Value Data' field, enter the full path of your installation directory. By default, this value is C:\Program Files\Strategy First\Emergency 3 Now, exit the registry editor by selecting the File menu and then clicking on Exit. The Emergency 3 Mod Installer should now function correctly