Why minitab install fails and give error on window 7?

Hi to everyone,
I am using window 7 Professional edition 32-bit and whenever I try to install minitab 15, setup process ends and gives error “Error 1722. There is a problem with this windows installer package. Consult your support personal”. I am wonder when every thing is ok like system requirements, installation instructions etc then why minitab install fails on my PC? Any help please.
