I cannot get a strong recommendation to install Lion on this older MacBook Pro2.2 as Apple does not say it is appropriate for this hardware.
I agree totally.
My disk needs repairing NOW and Software Update says my OS X is up to date.
Before you do anything, do you have a copy of your personal data off the machine on a external storage drive? (not TimeMachine for now)
Do that first, then whatever happens your data is fine. Disconnect the drive.
Next follow through these Steps to fix your machine or find out what's the problem.