Select your startup disk, then restart your Mac.

Click and enter your administrator password.

Choose Apple () menu > System Preferences, then click Startup Disk.

When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one.

Bootcampīootcamp can be setup in one of two ways, to always start in a particular OS or to give the optional choice on startup. If you need to easily and quickly run programs on both OS and have sufficient RAM and disk space and are willing to pay the annual licence fee, then Parallels should be your choice. If you only need to run Windows OS on your Mac with an occasional use of Mac OS then Bootcamp may well be suitable, is FREE and has less demanding hardware requirements than the alternative. Parallels – Is a paid third-party program which allows for both Mac OS and Windows OS to run simultaneously on the one computer, allowing the user to flick between Mac OS and Windows OS or display both on twin monitors at the same time.Bootcamp – Bootcamp is a FREE built-in Apple Mac OS utility which allows the user to restart the mac in a choice of OS ( Mac OS or Windows OS).A Mac computer can run Microsoft Windows OS in two or more ways: A genuine copy of Windows 7 Pro or higher is required. Mac computers are preconfigured with Mac OS ( El Capitan, Sierra, High Sierra etc) but do not come with a Microsoft Windows licence. iMac, Macbook, MacBook Pro, MacBook Air and Mac Mini can all run Mac OS AND Windows OS, so you can have the best of both world’s, however this is not possible on a Windows PC or Laptop. Mac computers can run Mac OS or Microsoft Windows OS.

Parallels for mac windows 7