Windows Explorer crash using W7

[Gtech]

I have W7 on 2 Computers, on the first computer I put Textpad on, it would crash Windows Explorer whenever I right clicked on a hard drive in the left pane. I then installed it on a second machine and had no dificulty, it installed fine and worked as you would expect.
I used a utility to disable Textpad in the right click context menu on the offending computer, this fixed the problem.
I'm wondering if anyone has seen this and I'm also puzzled as to why there is a Textpad option in the hard drive context menu?

Thanks for your time,
G