feel with your finger where the lifter goes in... is there a ridge or something in the lifter bore?
If it won't come out, either the lifter bore's messed up and you need to get some headwork done, or the lifter itself is messed up, and you need to replace it, and it may have fubared the bore anyway. you should be able to fit the edge of a screwdriver under the lip of the upper end of the lifter (if you can get it up far enough to expose it) and then pry it out.
you could try a suction cup thing on the top of the lifter maybe.
does the lifter come up at all, or is it completely stuck in its position?
--sarge