CorelDraw X6 won't work

I recently had to replace a dead hard drive in my computer. Among many other programs I reinstalled CorelDraw X6. About a week ago I ran into a problem with Windows explorer. In the course of solving it I did a repair on my Windows XP installation. Now neither CorelDraw nor Photopaint will open. I get the splash screen and then the user interface, but before the "What's New" dialog box opens the programs hang.

After trying a restart of the computer to no effect I decided to uninstall the X6 Graphics Suite and reinstall it. That's when I discovered it won't run the uninstall. I then tried just reinstalling and that wouldn't work either. I don't get an error message, just a blank space on the screen and a button on the taskbar.

In desperation I decided to go back to X5, only to find that it won't install either.

I'd REALLY rather not reformat the hard drive and start all over. Does anyone have any ideas about how to fix this?