What is your problem? Have you a Pc Computer?
Have you load the Pc Version against the Mac Version?
Have you copy/past the Serial number from the Readme file?
Have you an xp 64 version?...
< If you have an error with the installer, please, search for this error message in Google.
You will find a fix on Microsoft website, for WinXP. It's not an Amapi installer problem.

I have a normal Xp Version and absolutly no problem for install it!
Maybe disable all Antivirus or firewall before Install ?

The only little prob for me is that you can't close the prog by closing the "WindowsToolbar" so Go Menu File/ Quit :)