1. What DaddyG was trying to spit out was to get all the other crape off the ide ribbons. Just the hd's, nothing else. This gets you down to basics (finally learned this from my Dad--engineer) and will allow you to eliminate the hard drives as the problem.
2. Hard reboot to SAFE MODE. Go to device mangler and remove any ghosted/non-current devices you have showing. At work, I can always count on the pc's ghosting a couple monitors and an extra floppy, if not more. Hard reboot.
Then, you get to deal with the other crape.
3. If this doesn't do it:
overwrite your explorer.exe (assuming Win98 uses this for Explorer) with a known good version that you have .cab'd on your hard drive--YES, even if it's the same size file.
swap ribbons out
try different RAM/diff slots
I've had problems in the past with "some" 36" /33 cables. Go shorter.
The Memorex is non-DMA which makes being on the same ribbon "problematic" at the best. Actually, a decent, cheap burner. Based on the Philips 3610, I believe. Despite the problems they had with early units, Philips did continually update their firmware--but, I digest.
AND, let us know.
--Randy