So this happend. I hade a 650 gb disk with windows xp and got a new 240 gb SSD disk. I wanted to have windows 7 on the new disk so i innstaled it on the new SSD from windows. After doing this i got the option of wich windows I wanted to boot when starting up. After doing this I booted with the windows 7 disk and the formated the old disk. When I then tried to boot I got the message BOOTMGR is missing". I tried to disconect the old disk and I tried to formate the SSD and then it over again. It worked but onec i plugged the old disk back in i got the same message "BOOTMGR is missing". What to do?