CONFLICT I/O PORT: 2EF

I AM GETTING THIS ERROR IN CMOS. I NEED TO KNOW HOW TO GET RID OF IT. THE FUNNY THING IS, I PRESS F1 TO GET PAST IT AND THEN EVERYTHING WORKS FINE. I HAVE 1-SCSI,SYMBIOS ADAPTOR,1-IDE-1-DVD-1-CD-ROM-HP WRITER-1-TNT2 32MB,1-MONSTER MX400,56K ISA MODEM(THIS IS WHEN I STARTED GETTING ERRORS IS WHEN I PUT THIS MODEM IN), USB PRINTER,USB CAM,USB SPEAKERS, 192MB RAM, 500AMD.

THANKS FOR ANY HELP