"there is power to the driver's window switches ..."

The switches may be on a different circuit from the motors. If all the windows stopped working at the same time, check your fuse box again. Make sure the wire that feeds the fuse you replaced is fully on the spade connector next to the fuse. I had some trouble with mine falling off. I hope it's that easy. If not, look for corrosion on that spade connection and the fuse slot as well.
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'92 245 5-speed, '92 944 GL auto

Do any of the windows work by using its on-door switch? There can be power there even when the driver's panel seems dead. When testing the rear windows, remember the child proofing cut-out switch on the driver's panel.

First suspect is that a switch has accumulated dried-up grease and dirt. They can be disassembled and cleaned and re-lubricated.

Second suspect is wiring, that which goes into the driver's door. It is subject to work-hardening and brittleness, also can get frayed.

The relay in the PW circuit is only a cut-out that closes when the key is in Position II (run). It's purpose is security.

Good Luck,

Bob

:>)