Great question — answering as the UphillTech team:
Back in the days when I had my desktop PC. I used to partition my hard disk into multiple drives and install multiple windows OS in those separate drives. Like Windiows XP on C drive and Windows 7 on D drive. The OS selection screen would come up after your BIOS finished loading. I guess this would applies even today. Partition your hard disk using Adminstrative tools>Computer Management>Disk Management under Storage option. Dont forget to choose separate drives when you install Operating systems. Cheers.
Full answer by Shibu Thannikkunnath: https://superuser.stackexchange.com/a/943726 (CC BY-SA 3.0).
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