You might put inthe correct time& date see if it stays.If it doesn't then check your battery like btw1953 said.
on the other if your cd is a cd burner® then you should be able to DL to it like a floppy & use it the same way.
You may have to go into your bios & make the cd instead of the HD as your first start up device so it will do the flash from the cd.I have always used a floppy but I think that would work.
were you doing something to your bios before you started getting the error message?