msinet.ocx vista problem ( Activex Control even with register Regsvr with cmd )

I'm trying to run a program that runs fine on XP OS, but it won't run on Vista.
I've tried to install msinet.ocx in the system32 folder, but it never works.
I've tried to register with regsvr32 but it gives error
I've tried to register with regsvr32 with cmd as administrator it's register the Activex Control but it gives error
" Unexpected error "

is any body explain & have got any problem like this ?
thanks in advance to reply & reading.
Fary