Shared Library Manager conflict?

I tried to upgrade from British OS 8.0 to British 8.1 using the file I had downloaded from the Apple web site.  (I have a Performa 5200CD with 24 Mb RAM.)  This appeared to be successful but my Mac crashed shortly afterwards.  The symptoms were a general slowdown (I could sit and watch the boxes being drawn every time I opened a new folder) until things got so bad the Mac froze completely.  I attempted to restart several times (with and without extensions) but kept getting "bus error".

Even after restarting from a locked system floppy (the one which came with OS 8.0) my Mac would still crash if I tried to access files from my hard drive.  In the end I had to repair my hard drive three times (once using the version of Disk First Aid from the 8.1 system disk even though the version on my 8.0 disk said that all was OK) and did a clean install of OS 8.0 from my CD.  I threw out the previous system folder for good measure.

I was still getting problems (same symptoms) which rebuilding the desktop file and zapping p-RAM (both using TechTool 1.1.7) didn't solve.  I have checked for viruses using McAfee and am now at a loss.  My system works perfectly (in fact better than ever) as long as I don't activate either the Shared Library Manager or Shared Library Manager PPC extensions at startup - these cause the symptoms I have described and my Mac makes a short, quiet hissing sound just after the "Welcome to Macintosh" screen displays.

The net result is I can't use Open Transport and so can't check e-mail, surf the web, etc.  One other strange item of info: the drop-down box in the Modem control panel should offer two options (I think): "Modem Port" or "Printer Port".  However, mine offers "Modem Port", "Modem Port" or "Printer Port".  This oddity remains after trashing preferences, etc.

Now for the questions:

 a) Did I get a bad download of OS 8.1?  How can I tell?
 b) What should I do to get OS 8.0 working again?  Have I overlooked anything? (Please don't suggest reformatting my hard drive!)
 c) I updated the drivers during the installation of 8.1 and I'm wondering whether I need to "undo" this step to get 8.0 working again.  If so, how do I go about this?
 d) Does anyone know of any conflicts with Shared Library Manager?  It used to work fine before.
 e) Might it be a hardware problem?  Could the new memory chip I put in about 6 months ago have gone bad?
 f) What good tools are there out there to check for hardware problems?

Most points are on offer for getting Open Transport up and running again, but bonus points are available for satisfying my curiosity.
james_wintleAsked:
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james_wintleAuthor Commented:
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james_wintleAuthor Commented:
Edited text of question
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TheHubCommented:
Alsways do a clean custom install (for any macintosh) and reboot between each step. For example, if you want to install MacOS 8.0 with MacLink Plus, Open Doc and Cyberdog, only install the System, then quit and reboot from this new system (use startup disk) with all extensions on. Next, reboot from the CD and install the next component, reboot from the HD, etc. until you have all the componants of your system installed.

Then update to MacOS 8.1 (custom - for any macintosh). Reboot from the HD with all extensions on. You can then update to Open Transport 1.3.1 (url path below) and reboot (all on).

ftp://ftp.info.apple.com/Apple_Support_Area/Apple_SW_Updates/US/Macintosh/System/Mac_OS_8.1_Update/

Reboot from your recently purchased copy of the Norton Utilities 3.5 CD. Run the Disk Doctor, Speed Disk (optimize for CD-ROM Mastering) then rebuild the desktop using TechTool.

Go to the keyboard control panel and select British. You are now happy...:)
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james_wintleAuthor Commented:
Thanks for the suggestions.  I'll try this when I get the chance (I am going to be away from home for a while) and let you know how I get on.

Just a couple of things:
 - do you really recommend Norton over Disk First Aid?  Does it add a lot of value?
 - I just used Drive Setup 1.4 to update the drivers on my hard disk to a couple of versions more up to date than those on my OS 8.0 CD.  When I do the clean install of 8.0 should I deselect the "update drivers" option as this would use version 1.3 of Drive Setup?
 - does it sound like a software problem rather than hardware?  How could I be sure?
 - I won't try to install the US version of OS 8.1 as your URL suggests (this would definitely be a bad thing to do over the British version of OS 8.0).  Also I don't need to select the British keyboard option as I am using the British version of the OS.

Thanks,

 --James.
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james_wintleAuthor Commented:
I bought Norton and that seems to have fixed things.  My only reservation is that Norton reports my micrprocessor as 25 MHz wheras the 603e shouldbe 75 MHz.  Does this indicate some sort of hardware issue?

 -- James.
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TheHubCommented:
Many utilities misreport hardware queries (even Apple's) for different machines. It has to do with where the programmer of the utilitiy asked to get the information from the computer. You should take the info with a grain of salt.
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