How to reverse 10.8.5 update. iMac only boots in safe boot

after downloading maverick update, it started to install and computer no longer boots, only in safeboot. Computer in safeboot says it has 10.8.5. How do I fix this issue?
thx

You need to run the Mavericks installer again. If you have the Install OS X Mavericks you can run it over your install or you can boot into the Recovery drive and install from recovery.
To boot into the recovery drive hold down Command - R keys when restarting.
http://www.apple.com/osx/recovery/
I recommend you backup first not only to Time Machine but to a clone backup.
Both of these applications are free to clone. You would need to buy an external drive for the clone.
SuperDuper! http://www.shirt-pocket.com/
CCC http://www.bombich.com/download.html

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