It seems you're having the same problem Hunterwolf53 and KillerClam were having at PPM in this topic:
http://www.ppmsite.com/forum/viewtopic.php?t=16488My following post there seemed to have helped KillerClam to get it to work, but it didn't for Hunterwolf53...
QUOTE
I figured it might've not worked because you didn't update TS, so I ran I small test...
I copied all the files from the INSTALL folder on the TS disc to an empty folder on my hard disc and then installed DTA 1.0.3 over it.... It worked perfectly, so whether you have updated TS or not doesn't make a difference at all.
You should try starting TS itself from the folder you installed DTA into and see if that works... If it doesn't work, then there's your explanation.
If it does work, then there has to be something wrong with the DTA files... Maybe not all files were extracted from the zip folder or the zip folder got corrupted during the download.
If this is the case, first try extracting the files from the zip file again and see if it works. If that didn't work, try downloading DTA again.
I hope this'll work for you as well. By the way, if you try to download DTA again, try downloading it from a different mirror than you downloaded it from before (from my experience the judeau.franva.org one should always work fine).