have you checked recently ?

there is a patch that is almost 250 MB in size ...

hope that works

I have tried reinstalling, I have tried updating my graphics, I have tried the patch, I have tried deleting all the .ini files but it won't launch without them and causes me to either reinstall or validate to get those files back.
I tried disabling steam in-game community and that didn't work. I tried putting steam in offline mode and that just makes nothing happen when I click play. I guess that is sort of improvement?

Ugh... I'm having this same problem. I have been playing Vegas just fine the last 2 days... then I did some of the tweaks I found on these forums like the mouse tweak and the .dll file to smooth framerate. Got to play some more, quit out for a couple hours, came back and now this is happening. Nothing changed, I've reinstalled THREE times, making sure my computer was rid of any and all Fallout files. When I validate the files, Steam says 1 file failed to validate and will be reacquired.. but I guess that isn't happening.

I am pretty experienced with computers... I've tried everything I can think of.

AMD Phenom II x4 945 @ 3.6Ghz
4GB DDR3 @ 1600
GTX275

Mine still seems to be running, again I'm not really sure what I did to fix it but I know it happened on my third reinstall. Steam Community In Game is still checked on for me and originally I had that issue for the one file not validating, over and over. I don't think it's got the same thing going now but my computer runs the game nicely on ultra settings. I hope that you guys find a fix soon to get you in and playing, Solitaire was beginning to wear on me as something to do while I checked forums and fiddled around. Heh, either way if you've nothing better to do you can try variations of reinstalling, uninstalling... Opening the individual folders for the game and unchecking read only, checking run as administrator, unchecking run as administrator and manually running as administrator. I can't promise any of these will work for you but somehow I did something right and got in and that was before the patch was released. Good luck and I hope you guys can get on!

I've tried ALL of that

Have any of you tried opening C:/whereverFalloutisinstalled (Should be Steamapps probably, if you don't know how to find that, google it as I'm too lazy to remember) and looking at the *two* .exe's there. One of them should be something like FalloutNV and the other should be FalloutNVLauncher (They might be different). Try clicking on the one that does Not say Launcher, so, FalloutNV. That should avoid the launcher where you set the graphics settings, etc and Hopefully keep it from having to detect them. Hope this works.

Running Steam as Administrator can sometimes help (if the cause is related to insufficient rights to modify files), I've run into similar loop situations like this that were resolved by doing that.

Tried that. It doesn't avoid the launcher because the game still doesn't know what graphics settings to run.

Deleting my Steam > Userdata > ###### > ###### > Remote > falloutprefs configuration file fixed it for me.

** NOTE: "######" will be random numbers. For me, it is showing up as Steam > userdata > 7985413 > 22380 > Remote, but yours may show up as a different number. You may need to sift through a few folders until you find the right one. Nuke the file, and try launching the game.

Just tried that no Joy...

Tried deleting the config file and that doesn't work. I changed the compatibility to windows xp service pack 2 and when I click play it looks like it is trying to run it but then just does nothing. But at least I don't get stuck in the detecting video hardware loop

AWESOME, this worked for me! Must have been the 1 file Steam couldn't verify/validate.

Assuming you meant 5870, that's not it as I am running 2 of them.

nm

Bump someone has to know whats causing this.

Still no fix I can see for this. ANyone had any luck what so ever? Used to be a small group with same problems guess they found a fix or gave up...

Same exact issue here. The game won't play it just keeps detecting the video settings at Ultra High settings. Thing is I had no problem playing the game when I first got it, I have 7 hours played. Then one day it just started doing this. Please anyone have a fix.

When the installer is going to pass off to a configuration function, and the first thing it wants to do is detect components, it uses Dx9 extensions and the video driver to make some tests. This is just as likely to have been broken by whatever Obsidian has done that bypasses Dx9 erroneously and ends up causing the various Geforces and some high end Radeons to perform poorly.

Other than reinstalling the game itself, Dx9 is needed, fresh, and then especially for Geforces, old driver information needs to be wiped out when testing another driver of theirs, using something similar to Driver Cleaner.

For testing purposes, use the appropriate Clean Boot procedure for your version of Windows, following Microsoft's tutorial.

Ok so in english your saying...I should uninstall Direct X, install DX9. Then reinstall my video driver?

There is a small file "dxwebsetup.exe" available from Micro$oft downloads.
It will repair and update your DirectX to the latest.
That first, then the latest nVidia 260.99 package, and you've done all you can...
Also:
Check your nVidia Control Panel before attempting to run the game.
Set to High Performance. No forced AA, AF or vsync.
Select vsync off, from the game menu.
Try to get your monitor identified by Windows, mine is identified by name.
(The dxdiag posted had 'unknown monitor' and 'unknown native mode' listed.)
Good luck,
Regards

Notice how none of us are getting any help from Bethesda and they haven't even posted a thing for 2 weeks.

We are on our own.

This is OUR forum, for us to use. Official suppot is elsewhere. to get a proper FAQ about our work-arounds in here going, create it and send your text to a moderator with whom you are acquainted to get it pinned. If you have visited the support site, there are FAQs there, that have been growing and developing all along the whole two weeks.

Ok did all of that exactly as you said. Still doing the exact same thing. I want my [censored] money back, this game is a piece of [censored].

Ok now when i click play it comes up and detects for video settings and does nothing. When I hit play again, the menu dissapears and nothing happens. So at least its not continuously giving me the same error over and over anymore...lol still can't play the effing game.

Bump.....still no fix. 4 days without being able to play now...