Thank you so much for your replies and help, Taz!
I did find some Windows updates and installed them but it hasn't helped.
Trying to load the farm now and it's just sitting at the black screen, but at least I didn't get that error message so that's progress, right?
Yes, the clean ups do clear the cache every night. I can try to disable that part of the cleaners I use and see if it makes a difference.
My computer has 12 Gigs of RAM. I used to work people's facilities all day long with several farms running in the background while I was doing other things with no problems, so I don't think that's the issue.
After refreshing 3 times I finally got the farm to load. When I clicked to load another farm it didn't hang, so I think you're right about it being the cache.
Thank you again for your help, and I will let you know if NOT clearing it makes a difference.