When ever I use Installsheild or, whenever im installing something that uses installsheild, I always get this error " interface not registered" and it quits on me. This happens when im installing American McGees Alice and Napigator, but i think those are the only ones I've used that use Installsheild for installation. But when installing alice i get the same message but it will then say that a support file that is needed cannot be found. I have no clue whats going on here, if anyone could help me out here, it would be great. Just incase it matters, I run windows 98, 400 mhz, 128 megs of ram.

Thanks