I installed android OS in the second partition but i want use window 7 that is installed in first partition
Thats bad.. Why not install Windows 8.1 then..it will solve problem!
Do you have any friend who use windows 7? Ask him to make repair disc to a dvd..then you can use that to repair your windows...
Bro i dont have bootable dvd,is there any other way without using bootable dvd
same thing happened with me...
i was not able to boot into win 7 and few days later i was also not able to format but luckily one f9 day i had my luck and was able to format and problem was over..
but you can try putting your win 7 setup and enter into recovery mode and then repair your boot
or try holding right shift key when u start you pc or lappy before you boot into android!!
bro nobody needs to do nothing except a simple work....
restart your system and keep hitting f8
you will get a menu
asking you to enter whether into safe mode or to repair system
select repair system
now click start cmd
enter the following and hit enter..it restart..all done
"bootrec.exe/fixmbr"
don't include quotes...
if you do this android os will not boot yup..delete the partition that you installed and make it as a drive..
use vmware / virtual box to use dual os..
there is a like button under my post..hope you don't forget it