If you want to have Windows 8 safely, you can install SL in VirtualBox - I don't like this way, personally.
You can also provide some free space on your hard disk and install SL. Just be careful not to format your hard drive. Make custom changes while installing SL to hold your windows, or else you'll lose your windows. There should be no problem then. I have done this with one Windows 7 and Ubuntu, Trisquel, Fedora, and Sabayon.