Beegrite, you may have executed a update installer and not a full install. If the file name was written such as Ah1045.exe, for example, that is a full install file. If it was named something like AH104T1041.exe then it is a patch or update file and that does not have all the files necessary to run the game, only the ones needed to update the game.
My personal reccomendation is to do a fresh install of the game on the new puter with the full install file. If you don't have the latest version then download it from HTC's download site. You can then transfer your settings folder, sounds folder, and sights folder if you have customized those and would like to use them again.
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MarkAT
"It is not the critic who counts,
it is the man in the arena..."
Teddy Roosevelt