Hi Mrs Flynn and Lisa! I haven't taken the paintings off of the wall at all. I put the painting into his inventory from the easel by clicking on "take painting." When I try to remove it from his inventory to put it on the wall is when it is disappearing.
Lisa, I have not deleted anything from a sim at all unless the disappearing pictures qualifies.
I'll look at those links.
Edit: I tried to follow the instructions for the Nvidia video card, but only got to step 5/2. I do not have "High-Performance Nvidia Processor" in the list. It kind of looks like he used Win XP and I have Win 7 so it's slightly different. Mine totally skips 5/2 and goes directly to 5/3 "Specify the settings for this program." I have no idea what to do now.