Whenever I launch admin tool Computer Management, I get an error pop up,
displaying "Snap-in failed to inititalize. Name:System Information
Extension", followed by the CLSID. Any ideas on solving this problem are
appreciated.

Regards
Gary

This article may help you.

http://support.microsoft.com/?kbid=297064

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Thanks, but I'd already tried it (sorry, I should have said...).
Trying that suggestion, after step 4, I get a repeat of the error message,
with no "remove" option that I can see.

I think I'm just missing the "hardware" section from MMC, but perhaps my
memory is playing tricks...

Do you mean Device Manager? Also check Event Viewer for errors.

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No, device manager is there, I think my memory is playing tricks, it's been
a while since I'd installed Win2k - am most likely thinking of the hardware
option in MSINFO,

Anything in particular? There's quite a number there...

Also try msinfo32.exe

When you view the logged events in Event Viewer (double-click them in the
right-hand pane) in the upper right corner, third button down is a copy to
clipboard, then you can paste in the body of a reply message.

Please do so for each of the different System Log events (that are a Type:
'Error' or 'Warning') since last boot so we can see all of the event detail.

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URGENT: I'm desperate!
Computer crashes when installing sp2
Cannot find server or DNS error
Repairing OS
Problem upgrading Win 98 to Win 2000
Domain controllers
"3cmlink.exe has created errors"
Task Manager
File System
defrag