okay so to begin with my first problem..couple days ago tryd to come on my acer aspire 5750 while loading up it passed acer bios screen then went to white blinking dash and said boot mgr is missing.next problem i tryed got windows 7 disc popped it switched bios to dvd loaded to windows 7 installation i clicked installed/custom and removed all partitions and added back n formatted then tryed installing windows 7 on my 700gb hdd it wud stop at 55% or so and give me error 0x80070015 and installation wud stop.i tryed alt+f10 for factory reset but doesnt work im still stuck on bootmgr is missing.only way f8 works if windows 7 disc is in drive and their is no repair option or start windows normally.i tryed repair options trew windows 7 disc but their is no partiotons or drives w.e in it its just blank....idfk what to do i tryed everything...made iso for usb didnt work...please some1 help.