Bette, if your answer is yes to the following then see the instructions below in bold.
1st. do you still have your TM backups ?
2nd. did you do backups when you were running 10.7.4?
if yes then here's the way to get 10.7.4 back,
Make sure you copy all the stuff that you haven't backed up manually to a spare drive.
This fix will restore everything including 10.7.4 and wipe out all unbacked up data.
Hold command R down and reboot with your time machine drive connected.
You'll then have a few options to restore, so select time machine, find the file in the list thatis prior to 10.7.5 (it shows this in the listing) or in your case Bette after 10.0 and before 10.7.5.
Hit restore and depending on how much data, there will be an estimated time displayed. In my case about 45 minutes.
Spotlight is now fine and re-indexing within Minutes
Time Machine is back to normal and does not Hang.
I hope this is of helps đ