my fallout 3 will not let me finish "take it back"

[nickblank1991]

I cannot finish fallout 3 main story line because the liberty prime robot will not move when i go outside to follow it and i only have sentenial lyons following me any way any one else has had this or any way to fix it. thanks for your time

[Quagmire]

Do you have an older save before the mission started so you can reload and try again?

[nickblank1991]

i restarted the game and it did the same thing

[Ben]

Taken from http://fallout.wikia.com/wiki/Liberty_Prime

It is possible that Liberty Prime will have path issues on the first large bridge you cross, and get "stuck" requiring you to reload a save. Sometimes these path issues can be resolved by destroying the junked cars on the bridge. also fast-traveling to the Citadel (only an option if you are out of combat) while prime is "stuck" and run back to the point where Liberty Prime is will help solve the problem. Also Liberty Prime will sometimes simply not move from his starting location. He wont even try. If he gets stuck behind a car simply blowing it up will work however there is a possibility an Enclave Vertibird will crash in his path in which case you can shoot whatever you want at it but it won't move unless you get out the MIRV. Sadly this makes all Brotherhood forces except Paladin Lyon hostile towards you.

[KyleKyle Bensen]

It happened to me also during my first playthrough. I reset my xbox and booted it back; then it was fine.

I wouldn't bother with the MIRV. I have caused Prime to go berserk and lash out at me. Needless to say, my body washed up in Grayditch.