Before I upgraded to Win 7 Home Premium 64 bit I was running Vista Home Premium 64 bit and the beta for WindowBlinds 7 and did not experience and crashes with explorer or any problems in fact. It is running just fine with Win 7.
I don't want to go through all the things that Stardock support suggested, not doubt you tried it atleast once, correct?
Just asking, did you try the suggestions a second time? I know with somethings that I try and correct it takes two are three tries sometimes.
And now the silly question, with WB7 not running you get no crashes?
If that is the case are you running any other software that is associated explorer that could be the problem? Anything, it may be some type of addon or explorer enhancement.