Install Virtualbox(virtualbox.org) on/inside your windows OS( like you normally install any software on windows).
1. Download and install VirtualBox. (www.virtualbox.org)
2. Download the Linux Mint iso.(http://www.linuxmint.com/download.php)
3. Mount the Linux Mint iso with Alcohol (install it if you don't have it).
4. Run VirtualBox. Create a new VM for Linux Mint (give it at least 256MB of RAM.
(512 MB would be optimal.) Point the VM to the CD you mounted with Alcohol.
5. Linux Mint will run from the virtual CD. Once Linux Mint is loaded from the CD, you need to
install it to the virtual hard drive. On the Linux Mint desktop, you will see a "Install Linux Mint"
icon. Click it.
6. Once the install finishes and Linux Mint runs for the first time from the virtual hard drive, your
screen resolution will be too small. You will now need to install a VirtualBox component that
does not install by default.
7. Quit VBox. On your windows system, search for VBoxGuestAdditions.iso. Mount this iso file in
Alcohol. Install VBox Guest Additions. Reboot.
8. Run VirtualBox and load Mint. On the menu at the top, choose "Device / Install Guest Additions"
9. In Mint, click on Menu, Terminal.
Type: cd /media/cdrom0
10. Type: sudo sh ./VBoxLinuxAdditions-x86.run
11. Enter your password if needed. Install. Reboot Mint.
At this stage, to get the right screen resolution, all you need to do is drag the corner of the
VirtualBox window. If you'd like to login automatically, click the Menu, type "login", click on "login screen", unlock and check the box.