Installed the latest update and now Finder refuses to start/crashes

Hey guys,
I just installed the latest 10.4.11 update or whatever, along with Quicktime, iTunes, etc., and now when I log in to any account, Finder refuses to start. If it does start, it crashes.
I've googled around and all I could find was that I should switch from one Admin account to another to stop it, but that looked outdated and didn't work anyway.
I'm on a PowerBook G4, 10.4.11. Hopefully someone can tell me how to fix this soon.

Hi, and a warm welcome to the forums!
Actually, I take double posting to mean you started the same Topic in two different placesat once!
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot.
The usual reason why updates fail or mess things up, is if Permissions are not fixed before & after every update, with a reboot... you may get a partial update when the installer finds it doesn't have Permissions to change one obscure little part of the OS, leaving you with a mix of OS versions.
Some people get away without Repairing Permissions for years, some for only days.
If Permissions are wrong before applying an update, you could get mixed OS versions, if Directory is the slightest messed up, who knows!
If many Permission are repaired, or any Directory errors are found, you may need to re-apply some the latest/biggest updates again, or even do an A&I if you have enough free disk space.
An Archive & Install, which gives you a new OS, but can preserve all your files, pics, music, settings, etc...
http://docs.info.apple.com/article.html?artnum=107120

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