Messed with System/Library files now computer won't start

Ok, I wanted to go about fixing a Photoshop issue I had with 10.4.6. So I replace the following files with the files from 10.4.5...
/System/Library/Filesystems/AppleShare
/System/Library/Frameworks/AppleShareClientCore.framework
/System/Library/Frameworks/AppleshareClient.framework
My network drive went all haywire and I tried to replace the files with the original 10.4.6 files. After that did not solve the problem, I downloaded and used Pacifist to retreive the files from Mac OS X 10.4.6 for PPC downloaded from Apple. After replacing the /System/Library/ from this file, my computer went completely haywire and would not shutdown, start any aps or do anything. Now it won't work at all.
Am I completely screwed? I don't want to have to wipe everything (I have Quark on there that I no longer have a disk for) but I think I may have to.
Please if you have any suggestions for this stupid idiot, who should not have messed with their computer, they would be so welcomed!
Thanks!

HI, c.i.
See my "General advice on performing an Archive and Install" FAQ. Perform the steps therein in the specified order.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
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:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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[Mac OS X: Starting up in Safe Mode|http://docs.info.apple.com/article.html?artnum=107393]
[What is Safe Boot, Safe Mode? (Mac OS X)|http://support.apple.com/kb/HT1564]
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(68976)

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MacBook Pro
Mac OS X
Version 10.7.5
2.4 GHz Intel Core 2 Duo
8 GB 1067 MHz DDR3
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iMovie '11 9.0.9 (1795)
Keynote '09 5.3 (1170)
Pages '09 4.3 (1048)
Numbers '09 2.3 (554)

I have the same problem on a new MacBook Pro. I have not been able to access the iTunes library from iPhoto since I got this computer. I looked in the Preferences file and deleted the com.apple.iApps.plist but there was no com.apple.iApps.lockfile so I just deleted the iAPPs.plist and rebooted the computer. Still no iTunes available in iPhoto.
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So it is powering on. You did not state that before. In that case:
Reinstalling OS X Without Erasing the Drive
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Messed with System/Library files now computer won't start

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