Do you have Original OSX install CDs - so you could downgrade to the previous version?

remember to pull your data off onto separate media first (USB key, external drive that is not the boot drive) A full install may want to reformat.

this is a general suggestion as i haven't worked recent mac systems and doen't know how they distribute their OS. if you haven't cross posted to the computer forum here i would do that too...

(((hugs)))

~ waves ~