1. 21 GB free space on the HD
2. No... is that something found in utilities? I'll look it up.
3. Potato ... Yo... you solved it!
4. Whatever that spinning thing is I don't like it. Some kind of apple reminder thing... "your computer is getting old. buy a new one!"
5. 3 GB of ram.
6. I seem to be affected by all sorts of things. My spelling keeps any people employed furthering the advancements of otto correct..
7. 1 in 5? what I lack in performance I make up for in ingenuity.
Some troubleshooting ideas.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work.
If the problem is still there, try booting into the Safe Mode. Shut down the computer and then power it back up. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the grey Apple icon and a progress bar appear. The boot up is significantly slower than normal.
1. That should be plenty of free space.
2. Yes, I'd definitely try repairing the HD and permissions. To repair the HD you boot into the recovery partition by holding down command-R and restart. Then open disk utility. You can verify your startup disk, but not repair it, which is why you need to boot from another disk, hence the recovery partition. Which is cleverly hidden by ML on your HD.
3. Also you should back up everything first because maybe your HD is starting to fail. It's about time if it's the original one.
4. 4 gigs of ram would be better. ML should really be named Ramhog.
5. The guest account and safe mode suggestions above are good too.