Do u mean the " select the OS to boot " menu then u shud check ur bios u can enter bios by pressing a key(different manufacturers hav set different keys my acer lap has F2) at the startup when ur manufacturers name shows up n then aftr entering into the bios go to boot menu n check if ur hdd is given the first priority in boot priority
OR
Do u hav another os on ur hdd or some leftovers of it then plz delete it
OR
Is there a cd/dvd in ur optical drive if there is then remove it
This might wrk or mightnot i am not sure about this plz join WC to let us know if ur problem was solved or if it is still there then u can describe ur problem better..gud luck..