Hi Rob, sounds like Spotlight is messed up, which we could work on, but...
Find Any File...
Hold Option or alt key when selecting Find to Find All.
Search for Size> is Greater than> 10 mb
I figured it out myself. Awhile back, I noticed that the Mac would seem to hang, and I couldn't do anything. Activity Monitor showed me the cause of the problem was a program called mdworker. I did some research on the web, and found out that mdworker is part of a program called Spotlight. I never used Spotlight, never even heard of it, and didn't see any use for it, since we have Finder. So I followed the steps to disable it.
I re-enabled Spotlight, and that fixed the Finder problem. So apparently Finder relies on Spotlight for the Find function. It doesn't need it for the normal file managing purposes.
I guess I'll just have to put up with Spotlight/mdworker hanging my system occasionally.