alianyn, first of all let me THX to ya for this blaster.
I think the problem isnt with your proggie (current ver.), i've installed it and simply works fine n i have lots of other shell hooker stuff installed. (XPsp2, wb5.0.1, wfx3.0, üi1.0.2.38, vtt, inactive dx3.1 and inactive styler1.40) Maybe a previous version left something wrong on those machines, or other finder like stuff killed them.
I'll be back soon with some facts and tips i found, just throw them among you've already got
TIP: dont kill explorer after register, hit a pure computer restart instead!