Thanks for the help Spiritz. That isn't quite it but I'm definitely on the right track.
I don't see the "rebuilding gw.dat file" message, but it shuts down and restarts so quickly that it could be flashing that message and i'm just not seeing it.
I don't have 2 computers, but I do own 2 accounts and each is installed into different directories. I deleted the gw.dat from my main and copied over the .dat from the 2nd directory. They were different sizes so a corruption someplace sounds about right, however it didn't fix the issue. GW is still restarting even on the fresh .dat.
However, I tried texmod with the 2nd account and it's fine, so I just changed the login info for that copy to my main account and everything is up and running with texmod. I'll probably need to completely uninstall my main and re-install fresh from discs. Sounds like something has gotten crossed someplace.