I see there's two WT files, so have you already tried reinstalling, right?
This has been an issue with a few players now, I entered my own gamefiles and couldn't find anything labeled as such, but http://www.aeriagames.com/group/77/announcement/71
has everything else available for download and direct replacement. It might be one of those files.
Before you try that though, can you post your computer's specs and any Anti-Virus/Firefall programs you have installed/active?
To get your specs
Press Start and go to "Run"
Type dxdiag in it and press ENTER.
Use the Save Information button and save the file on your computer.
Copy and Paste "System Information" and "Display Devices" and post it here.
Post ONLY the information from System Information and Display Devices, otherwise it'll just give a bunch of excess stuff that has no bearing on why the game won't run. Oh and under System information it'll also show the "Computer's Name" which Vista pretty much places under your own name you enter into the computer. You might want to censor that if you don't want people knowing your real name.