No, IMAPI isn't just for Windows XP. Try it one more time, then quit Spin It Again and send us your spinagain-log.txt file, which is located in this folder:
%appdata%\Acoustica\Spin It Again\
You can also find it by clicking on the Windows Start menu, selecting All Programs, then Acoustica Spin It Again and finally Logs. Submit an Acoustica Support Request
and attach the log file.