FSX OOMs after installing JOG scenery

I recently installed a scenery of WARJ from FlightSim.com (http://www.flightsim.com/vbfs/content.php?108-Copyright&fid=166385), that required me to replace the APX77340.BGL file included in the \Scenery\0904\scenery folder. To my surprise, after doing this, FSX displays the following message while building the scenery database.:

"Your computer has run out of available memory. Please restart Flight

Simulator and select different graphics, scenery or traffic settings"

I even reinstalled the original file supplied with FSX, but the same message continues to appear within each time FSX starts up. To make matters worse my FSX DVD won't load anymore, which makes it almost impossible to reinstall and/or repair FSX. Can anyone help me with this.

Regards,

Dave.