umb upper limit segment address dc00 t43 problem after defra

[radiator]

I defraged C partition (defragler) then rebooted XP SP3 on my T43 and got some info from bios video shadowed, password shadowed and umb upper limit segment address dc00. The problem is that xp won't boot saying pcidex.sys replace or sth like this. I got connected HDD to my pc and it works fine. I see files & folders no errors. Also replaced the above file but no luck. When I try to reinstall os on my IBM installation stops just after beginning. No idea what to do.
Please help me to solve my problem
thx