Camtasia Studio installation fails in Vista Home Premium

I am using Windows Vista Home Premium SP1 operating system.
When I tried installing my newly bought Camtasia Studio 5.0.2 (Full Version), I got the error message shown below:
Please help me figure this out.
I hate wasting money, and I don’t have time to get through to their customer service.
Thanks!

Installer Information
Error 1 904. Module C:Windowssystem32FlashFlash9b.ocx failed to register. HRESULT -2147220473. Contact your support personnel.
OK
Advance thanks for solving this problem.
