Installation problem, when I try to repair with the installer, command buttons disappear

Installation problem, when I try to repair with the installer, command buttons disappear to continue installing the same happens if I want to delete or modify the software.

I tried manually uninstall it, but there is a registry key hard to remove and tells me that I continued to have the coreldraw installed and I had to go back to recover system, but the application is no longer running.

My OS is Windows 7 32 bits
My coreldraw is CorelDraw X5 trial version only had 7 days of use.
Attached image of the window installer and it has no buttons and I can not go from there..