You say you put high pressure in them and they're still not seated? Do they seem unseated near the tube? If so let most (not all, you want the tube to keep its shape) of the air out, unscrew the nut on the valve stem (the one that screws down to the rim) push the valve stem up pushing the tube into the tire (carefully look at the bead to make sure the tube isn't caught underneath) then inflate the tire to it's proper pressure.

Of course I'm assuming a 700 sized tire with a presta valve. If you have an MTB tire, you have a Schraeder valve. Deflate the tire, push the valve stem up to push the tube up into the tire, making sure the tube isn't caught under the tire bead, then re-inflate the tire.

Let know if that works or not.