1 : Boot in Mageia and open MCC
1 bis : If you do not know the # of you windows partition, open the disk manager and find it (Blue one). If you are not sure, you can even click on "see content" (not sure of translation) and see if it contains program files etc. note the # "sd[abcd]#" or "hd[abcd]#".
2 : Go to bootloader editor, and add an entry. Choose other system and select the correct partition. Name it windows. Now you can go in windows
