I'm running Windows XP and Internet EXPLORER browser. My computer is custom built. My question is why is my computer unable to instal directx 9?  At the end of the instalation I get an error
BADWINDOWSVERSION and it says its not compatible with my windows version. I have used directx 9 in the past, but now i am un-able. Does anyone KNOW why?

Thx

P.s. The game i am trying to run is battlefeild 2142, which is also SAYING i need an "un-modded" version of it. I have never modded any games so im confused by this. The game use to work before i installed the newest patch Please see here for the latest version of DirectX.
As for your BF2142 problem, just install the patch again. If that does not work, do the following.
Uninstall the game from Windows Add/Remove Programs.
Delete the folder from C:/Program Files/Electronic Arts/BF2142
And delete My Documents/BF2142
Do a search for BF2142 and delete all the folders you see.
Download CCleaner and use it to clean your system, as well as the registry with the Issues function (make a backup when prompted).
FINALLY, go to Start - Run - type regedit and press enter.
Search for BF2142 and delete all the KEYS you see.
Reboot and follow these steps again, there should be nothing left.
Then install the game again, and the patch.
Hope this helps.Thx for you're help.
I did what you said and both directx and Bf2142 were working
However when i reinstalled northen strike i can no longer join any games, still the "only non -modded version can join" so i think northen strike was what caused all the problem in the first place Install the patch again.
It's a known problem, you must first patch to 1.2 or later, then install NS, then install the patch again.
I had the same problem.
Hope this helps.Thx alot again ill try this nowYou're welcome, let me know how it goes.
Add me when you get on if you like BTW, it's CalumH on BF2142.It worked!
Thx for all you're help with my problems.
I'll send you a buddy invite.Use name is Machinemastery btwYou're welcome.
I'll probably see you in-game later on.