It's probably not there because DirectX didn't install properly. DirectX 10.0 comes with Vista and 10.1 comes with SP1 for Vista (there is also an enhancement in SP2). If you have Vista (any Version) you should already have DirectX 10.0 (at least) and
10.1 if you downloaded SP1. I'm sure the DirectX.log is in the Windows directory (not so sure about the DXError.log) so if it isn't there there may be something wrong with your installation or some corrupt files interfering with it now (perhaps even some
There's no way to download DirectX 10.1 directly to Vista - it's built into the Operating System and there's no separate download available (and you can't really downgrade to version 9 with Vista). This may become available (they're already working on a DirectX
10 download for XP) but not yet (and maybe not for Vista ever since it's built in - similar to Defender).
If you have Vista and don't have DirectX10.0 or higher, then I suggest you download and re-install SP1 (assuming you haven't already installed SP2). This may fix your problem.
If not there may be something corrupt in your system files.
Then let's check some of your system files:
Go to Start / All Programs / Accessories / Command prompt and right click on command prompt and click run as Administrator (you can skip this step if using the disk).
Type sfc /scannow and enter and let it run. It will scan and try to fix some of your system files. Hopefully it will complete with no corruption it could not repair (if there is such corruption post back here or try to analyze it to find the problem file(s)
using http://support.microsoft.com/kb/928228.Try to post any corrupted files here so we can see if they can be repaired with good copies from the installation disk (unless there are too many).
While in Command Prompt, type chkdsk /f /r and enter and let it run. It will scan and try to fix any corruption or bad sectors on your hard drive and mostly remove that as a potential cause.
If that doesn't work, then please post any repeating error messages from the Event Viewer concerning DirectX (Start / Control Panel / Administrative Tools / Event Viewer – or typing eventvwr from the command prompt). Here's how to use Event Viewer:
You may be infected with malware. Try to run anti-malware programs (in safe mode with networking if
necessary). To fix this problem (if it is a problem) download, install, and run the following two programs:
http://www.safer-networking.org/en/index.html. You may also want to try a free trial of Pandasoft (www.pandasoft.com).
Before downloading pandasoft, uninstall whatever anti-virus program you are currently using (because installing and running two at the same time can cause conflicts, freezes, and all sorts of problems). Once you've uninstalled your current AV program, download,
install, update, and scan using Pandasoft. I think you might be amazed at how much it finds that the other software missed. Once complete, uninstall pandasoft and re-install your current AV program (unless you decide to switch which I did when I first tried
it about 4 years ago). You may also want to try the new, free Microsoft Security Essentials
http://www.softpedia.com/progDownload/Microsoft-Security-Essentials-Download-131683.html(with the same caveat that only ONE AV program can be installed and running on your system at any one time).
You may also want to try the free Avira at: http://www.free-av.com/. Reboot after completing all the scans.You may also want to try the free OneCare at http://onecare.live.com/site/en-us/default.htm and let it run all the options
because that’s good maintenance (it will take some time to complete but can be done in the background).
If that doesn't work, we'll need to do a system repair/upgrade using the genuine Windows Vista Installation Disk (one you own or one you can borrow from ANYONE). Here's the procedure:
http://www.vistax64.com/tutorials/88236-repair-install-vista.html. Although this will not affect your data,
settings, or programs, you should still backup your data before starting just to be on the safe side. If the other procedures don't work, THIS one is almost certain to work. You may have a lot of updates to re-install (including any service packs you had
to remove). If the version on the system came with SP1 or SP2 pre-installed and the disk is an earlier version, then you'll need to make a slipstream disk as follows:
Hopefully one of these procedures will resolve your problem. If not, post back and we'll try something else. Post back in any case so we'll know how it turned out.