2.
Fallout Script Extender (FOSE) by Ian Patterson (ianpatt), Stephen Abel (behippo), and Paul Connelly (scruggsywuggsy the ferret) The Fallout Script Extender, or FOSE for short, is a modder's resource that expands the scripting capabilities of Fallout 3.
It does so without modifying the Fallout3.exe or the G.E.C.K. Now you just have to install it and setup the fose_loader and your done! Launch Fallout by running fose_loader.exe from the Fallout3 directory. Now that you have FOSE downloaded, it is time to install it.

I just unzip it into my downloads folder. It should come in a zip archive. Then you should see a folder called fose_v1_2_beta2. Copy the.dll files and fose_loader.exe to your Fallout 3 directory. Installing FOSE. This is usually in your Program Files folder, and should contain files called Fallout3.exe, FalloutLauncher.exe and the G.E.C.K. Congratulations you just downloaded Fallout Script Extender! files on disk, so there are no permanent side effects.

(if installed).