I have win8 RP in c drive and win7 ultimate in d drive.now suppose I m on win8 RP and want to run win7 on the next reboot.the only method I know is to go to disk management------>make the particular(d drive) partition as active,but doing so will deactivate the current current drive(c drive).I want the choice of choosing the O.S. at the time of booting....is it possible?