Installation issue with X7.3 update, dialog window too small to show content

I have an installation issue with X7.3 update.  On my Windows 7 Pro 64 bit Lenovo laptop, the installation progresses to a point where a small window opens up and shows only part of the Corel balloon icon and nothing else.  No buttons, no scroll bars, cannot maximize to show anything else.  I had a similar issue with an upgrade of X5 to X7 on a Dell Latitude.  Is there something I can do?  Repeated downloads don't change anything.