bootcamp not installing windows 8.1
hey guys i have been trying to install windows 8.1 on my macbook pro early 2011 which is running yosemite but whenever i turn on my mac and pressing alt key for the options , the options that i get are macintosh hd(my yosemite) , revovery , efi boot(which isnt working as i am not able to install windows in the bootcamp partition as it is mbr partition table and not gpt) so i have tried many other ways to make my sd card 3.0 an bootable pendrive but everytime the result is efi boot which just doesnt work then i tried to install windows xp of which i was having an cd and the option came in the alt option menu (wint an disc icon) AND GUESS WHAT IT INSTALLED ON THAT SAME BOOTCAMP PARTITION!!!!!! which i had burnt using disk utility(i had an .iso and burnt it on an black cd and made it windows xp) ...... so my question is why the heck it doesnt work when it comes to my sd card(usb 3.0) does my macbook 2011 support only cds and dvd???? PLEASE REPLY FAST I AM TIRED OF TRYING TO SOLVE THIS.........
PS:I have seen many photos in which when they press alt key for the options there were 4 of them (macintosh,recovery,windows,efi boot)..........SO WHY THE HECK DIDNT I GET ANY WINDOWS OPTION AND ONLY GOT THE EFI BOOT
PLZ RPLY