I recently bought a hp 15 notebook(15r-119TU) ....It has win 8.1 preinstalled on it... now i want to install win 7 on it... i have inserted my win 7 setup disk..but i'm not getting any option to boot from CD/DVD in the start up screen... it's just getting booted up in win 8.1 ...I have enabled the boot from CD/DVD function from BIOS ... but still not getting the black screen "press any key to boot from CD/DVD" with this message... I have checked my win 7 setup disk...it's all ok... So what's the rpoblem with it... plzz help... thnx in advance