Several versions of Windows operating systems have been launched and many of us wonder as to if it is possible to instal two operating systems in a single PC. Yes, definitely you can instal two operating systems in a single PC provided there is enough hard disk space on your PC so that both can work efficiently. Here are some tips on how to instal two Operating Systems in a Single PC. First of all, you will need to have original disc for both the OS and if you have one OS already installed in your PC, then you will have to create a partition in your hard disk and this you can do by using the Partition Manager. After that, first install the older version of the OS and then create a partition of minimum 10 GB using Partition Manager. After that restart you PC and boot up your PC with the other disc. It is important to ensure that you select new partition and not upgrade and after it is done, restart your PC again and both are installed.