This tutorial will teach you how to mount an .iso file (otherwise known as a CD/DVD image file) to a virtual drive using Daemon Tools (Download here).
Now that you've downloaded Daemon Tools, start installing it. It will require your computer to reboot before it can finish installation. After the reboot, you'll be able to configure what parts of the Daemon Tools program are to be installed. If you are installing Daemon Tools just for the use of mounting your .iso files, it's recommended that you use these settings during installation, to keep things minimal and not install unnecessary files:

Also uncheck the "Browser's Start Page" option on the next screen.
Now that you've installed Daemon Tools, we're ready to mount the .iso image. If Daemon Tools is not already running, you can open it through the Start menu shortcut or the desktop shorcut that was installed.
Daemon Tools appears in the notification area of the task bar. Right click on Daemon Tools to see your options.

Move your mouse pointer to where it says "Virtual CD/DVD-ROM," then you will see "Set number of devices..." Depending on how many .iso files you'd like to mount simultaneously, choose a number. In this tutorial, I will just choose one. Now we will mount the .iso image to this virtual drive that Daemon Tools has created.
Right-click the Daemon Tools icon, go to "Virtual CD/DVD-ROM," and then move the mouse over one of your devices, then click "Mount image."

A new window will pop up, use it to navigate to your .iso file, then click open. Daemon Tools will read the .iso file and open it.
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