My Dimension 8400 (full specs below) is having intermittent problems displaying and saving graphics on the 'net. Some sites - but not all - will display only a few graphics on a page while other sites display all of them just fine.

Then, also sometimes, when I right-click on a displayed graphic to save it, I am unable to do so: I can't give it a name or change the save location.

In both cases, I've tried using IE 6+ and Firefox 1.04 and had the same results. That makes me think it's not browser-specific.

In both cases, I've tried exactly the same things at the same sites on two other machines and had NO problems. Which makes me think the problem isn't the sites themselves.

I'm stumped. Any ideas?

Thanks for any help!
Ed

System:
Dimension 8400
XP home SP2
3.2gz processor
1 gb RAM
Radeon x300 series display adapter, with
Radeon x300 series secondary adapter (what is this?)
Dell 19" LCD flatpanel screen running 1024x768, 32 bit color