OrCAD 17.2 won't show up in Sart Window

Hi

I have Orcad 16.6 and 17.2 versions installed on my computer. Earlier it was showing both 16.6 and 17.2 in Start Window but now it is only 16.6 showing up and cant open the 17.2 release.

I can see that both are installed in Control Panel.

Thanks