Dos Compatabiltiy Mode

Installed a game on a Packard Bell 486 computer running win95 with 8mgs of
ram.  The game (Titantic) installed direct X, since then we see the CD ROM
drive and it loads  the driver but won't recogonize any cd's.  Asside from
this windows is running in Dos Compatability mode, which, from what we can
gather means that there is a conflict between a real mode driver and a
windows protected mode driver.  We have tried everything to get it back to
the way it should be, but we can't.  Since we have Windows on CD, we
borrowed the disk version to reinstall windows, thinking this would cure
the problem, but it didn't.  According to the message that comes up about
dos compatibiliity mode windows should tell us what driver is causing the
problem, but it doesn't.  We have tried to reconfigure the Autoexec and
config and even remmed it out, we have looked in the registry and found
nothing.  

We have since removed the Harddisk control driver which had an exclamation point and reinstalled win95 again and rebooted.  We are still in Dos compatabiltiy mode even after reinstalling