You haven't mentioned whether you are trying to repair it or just reformat and install OS etc. Schematics are not available or even if they are, repairs are not worth the effort as you'll no longer find parts for it.
However you can still get drivers and updates for it.
I've searched a bit and found the HP care website where you can download drivers, firmware and manuals.
HP Pavilion 8766c Desktop PC US CAN support
Upgrades updates
HP Pavilion PC Model 8766C Product Specifications and What Ships in the...
While you may disagree, I don't think it would be worthwhile to invest any time& money in looking for processors, memory etc as it is now a very old system and practically as powerful as a mobile phone or even less.
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HP Pavillion 8766C. Trying to get old processor running. Has Windows ME.
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