
Download
Daemon Tools 
Install it(Duh

)

Once you have installed and started DAEMON tools, you should now see a "lightning bolt" icon (green) next to your PC clock

Go ahead and right click that icon and then left click "VIRTUAL CD/DVD-ROM" , then left click "Set number of devices...", then decide on how many virtual drives you wish to have. 1 drive is enough for you.

After that, go ahead and right click that "lightning bolt" icon again, left click "VIRTUAL CD/DVD-ROM" again. Then left click "Device 0: [*Letter*] No media", then left click "Mount image".

Then on the screen that pops up, navigate to where your ISO file is to mount it to the virtual drive. When you find it, click it once then click the "Open" button
Now if you go to "My Computer", you will see a "extra" drive listed there . That is the "virtual drive" created by DAEMON Tools.To remove it, right click that icon and then left click "VIRTUAL CD/DVD-ROM" , then left click "Set number of devices...", then click "Disable"