At which point does this screen appear Michelle ?
Is it after its detected the primary and secondary drives ?
As Simon said it may be the boot sequence in BIOS that isnt set as normal.
Depending on which BIOS it is try setting the boot sequensce to A,C,CD-Rom.
If its the BIOS that has first,second and third boot devices then set the first as Floppy,second as IDE-0 and third as CD-Rom :doggie: