Bios Issue

Everytime i restart my compaq 233mmx deskpro i am asked to update my changes. I accept changes and do not make floppy changes when asked to. Windows comes up with no problems but everytime i restart the machine i am prompted to accept cmos settings. I went to compaqs site and update the bios and still i get prompted with this message. Nothing has been added to the machine and nothing has been taken away. what can i do to resolve this issue?