How i can install Opus under Vista?

I try to install but when finish the setup tells me that "cant open the file c:......\Dopus.exe" i go there check and the setup dont install it this file, why it appends?

There are some threads linked from the Vista FAQ which may help you until Opus 9 is released with proper Vista support.

Keep an eye on the Announcements forum for word of Opus 9. It shouldn't be much longer.