Here's on how to disable the annoying mouse acceleration.

[Galaxy366]

When the Fallout 4 reveal happened I basicly decided now was the time to play New Vegas.

My biggest annoyance was the way how the mouse and camera worked. I found out this was because of the game using mouse acceleration.

I managed to find a simple fix which disables it completly.

Go to:
C:\Program Files (x86)\Steam\steamapps\common\fallout new vegas, (or a similar directory)

And open/edit Fallout_default.ini.

Then navigate yourself to the section [CONTROLS] and add these lines.

fForegroundMouseAccelBase=0
fForegroundMouseAccelTop=0
fForegroundMouseBase=0
fForegroundMouseMult=0

Save it and boot up New Vegas. Mouse Acceleration is disabled!

[STOPchris]

Please, PIN THIS! Thank you! This removed it for me. The game was crap with mouse acceleration.

[Get_Ready]

thank you!
also found this on a website but this should be pinned

[baid]

Thanks mate!

[xDizzyBx]

:D

[Galaxy366]

No problem guys! Enjoy the game :)

[Crystal Sharrd]

I would like to add that by default, Fallout_Defaults.ini is read-only, and when you make changes to it, you have to start the game with the official launcher for the changes to take place.

[TOVOT]

"I basicly decided now was the time to play New Vegas" - The Guru of the Time (not sarcastic)

[KrudlerTheHorse]

Thank you for this. It worked perfectly for me first try.

[karma]

Thank you so much! I love you, man! You're the first one for google, too xD

[slice of green]

I would just like to add that doing this also works for Fallout 3 by doing basically the same thing but in the Fallout 3 folder

[キールス]

Can someone Pin this.

[Sic.bn]

+1

[sasha]

MY SAVIOR!

[Potato]

Thank you.

[Big Ron]

I owe you my life.