CS5 Suddenly Stops Saving and Opening PNG & GIF Files

Question

CS5, windoze 7, 64 bit.
Inexplicably, CS5 just stops working with PNG & GIF format files.
Fine, this morning; but not after lunch! Indigestion?
Bridge says it's missing a/the java plug-in. Huh? Java is up to
date at OS level.
Very puzzling. Anyone got a fix for this?

Answer 1

Kind of you to reply and offer assistance - thanks.
First, I'm inquiring for my wife. I.e. I'm not the user. She's not all that comfortable with using Forums.
I use Photo Impact - now part of Corel, as I understand it.
She says she can't open or save those formats, as she used to be able to. But she can open PNGs
in Illustrator.
The bridge error message is generated on clicking bridge, when no other task is running:
Adobe Photshop CS5 Extended
Could not complete your request because
Photoshop was unable to find the javascript
plug-in.
The mini bridge also gives an error message when clicked on, with no other task is running:
Adobe Photshop CS5 Extended
Cannot complete command because the
extension could not be loaded.
She reports that a lot of Save As options have disappeared. If this was Photoimpact, I'd be
checking the FIO folder for the necessary fio files, but I don't know how PS manages the
way in which various file formats become interchangeable for saving/opening. What that
has to do with bridge, I know not. I don't know the first thing about PS.
That said, chronologically, the problem seems to have occurred after the installation of
a number of pre-sets. That makes me suspicious of them. Or rather, the installation
process that they involved. But I don't know for sure, nor do I know how that installation
of presets process might be reversed, to check if that caused the problem. (see below)
Oh, she has executed an update, but that didn't fix the problem either.
If there's no easy way to achieve a remedy to the problem, I'm contemplating doing a system
restore. She's presently moving (backing-up) those pre-sets before any roll-back is attempted.