Computer keeps asking to be restarted after update

Its an old G4 450mz that is running OSX and has been updated regularly with each patch that has come out. For some reason after todays update it keeps wanting to be restarted. The message I get after each restart is that its been updated and needs to be restarted. Every restart gives me the same message. Is there a way out of this ? or a way to revert back to what I had previously ? Not much of tech guy just a mac user
Help me Obi Wan, your my only hope.

Alis1968, welcome, bootup from the install CD (C key held down) and once the disk mounts (X window) open Disk Utility from the Main Menu under Installer. Choose your drive in the left column then select First Aid, now run the Repair, if it does not repair run it again. Now select the startup volume (with the OS) and run the Repair Permissions, quit Disk Utility.
Now go back up to the Main Menu under Install/Change Startup Disk and select your startup volume then Restart.
Now do a PRAM reset on startup.....
1. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
2. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
3. Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
If this does not solve the issue then take a look here.
Joe
ps. This is the 10.3 and later section, maybe that is why no one has answer your question until now. Your post does not say, but your profile does say 10.4.
Power Mac G4 Gigabit Ethernet Mac OS X (10.3.9) 1.5 GB Ram, ENCORE/ST G4, Tempo SATA, ATI Radeon 9000, Adaptec 4000

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Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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Computer keeps asking to be restarted after update

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