I had a heck of a time getting the mod tool running in Win 7, Fred. It has official support up to Vista and Win 7 is mostly that at the core but it would run, break, install, fail to install until I finally one day just got it to take.
It took constant installs and re-installs to get it working and for now it seems set.
My impression was there are two features in the mod tool that try to install in a certain order and if they get hung or delayed the installation of the tool fails or it crashes on use at some point.
On the install that was successful, I noted I got past these two things that I hadn't seen execute before during the installation so I assume they are the bottleneck.
I just "rinsed and repeated" my installation about 18 times for it to finally take.
The .bat I, believe, goes back and tries to make sure things that might have missed being registered on install get registered before you start the program up after installation. It didn't solve my original problem.