Crashed windows, reinstall doesnt work

Help!

I purchased Directory Opus 10 on 24th of April 2012 and my windows machine crashed recently, after I tried installing Directory Opus with my serial number it says that this directory opus has been registered to another machine.. How do I go about installing it on my new installation of Windows?

That doesn't sound like a message that would come from Opus.

What is the exact error message?