So strange.
Yes, I assume that uninstalling CS5 would work.
But if you're not ready to do that, you'll just have to keep using Ctrl O, rather than Ctrl R, to open the files, eh?
I'm so sorry, I can't see those links for some reason. It's possible the photographer has their page set to only be visible to people from her own country.
I'm afraid I don't see how cloning will work by itself, since the glare is obscuring the curve of the crease of the upper eyelids.
It will take some very careful copying/pasting/moving/rotating/masking of the creases from the outer part of each lid.
Unless you are in desperate circumstances, ditch it.
Good sharpening would be able to make a passable print out of it, but if hung next to a genuinely well-focused shot, it would be apparent.
The trick, I've found, is to photograph it in dim light. The painting doesn't move, so you can leave the shutter open for as long as it takes. You need to be out of any direct light at all.
This is partially relevant: http://www.damiensymonds.net/2010/10/tips-for-photographing-old-photos-for.html