Is there a non spammy, no registering, free site to download old drivers?
It's probably not going to help you find really ancient drivers, but 64bitdrivers.com is pretty much beyond reproach, as far as I've been able to tell. Honest site, free downloads, no spam.
OEM - Original manufacturer's site will always be the winner. Any site that gathers them all up and hosts them separately is going to have an ulterior motive. If you're lucky, it's just to get ad clickthrus.
This can be its own wild goose chase, but I have yet to dead-end on drivers for old hardware this way.