DOS is well-suited for older computers that are not powerful enough to run a modern operating system such as Linux or Windows. If you have a modern PC, DOS programs can be run with DOSBox.
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You have to install windows 98 using the OEM CD from Microsoft (or you can download it as a torrent file). If it is a DOS-window, then with command EXIT, or if you booted in DOS-mode, then use command WIN (or reboot your computer).
You do not need to "install dos". DOS is already installed in all computer running any Microsoft OS (operating system). To access the DOS terminal simply click the start button, click run, then type cmd and hit enter.
Computer
You can't run MS-DOS, windows is different operating system. You can type cmd to invoke command prompt. Also, you could install DOSBox to run DOS programs, OR install VirtualBox and install DOS inside it.
Craig Menefee has written: 'Harnessing DOS 6.0' -- subject(s): MS-DOS (Computer file), PC-DOS (Computer file) 'Byte's DOS programmer's cookbook' -- subject(s): MS-DOS (Computer file), Microcomputers, PC-DOS (Computer file), Programming
You should install a good anti-virus in your computer.
If you are talking about an old game such as doom 95 or doom for MS-DOS you will have A. Try Windows compability mode B. Use DOS-BOX http://www.dosbox.com/
DOS
You should install it on a hard drive of the computer where you will use the application.
Try deleting it from the computer. Then, eject the disc, and put it back in and it should automatically install or give you the option to install it.
When you start the computer you will have the hard disk test the computer to make sure it is working properly so when it is working the way it should, you should be looking at the part of the computer most useful to you (either the desktop when Windows is installed or the DOS prompt if MS DOS is installed)