How to run Windows on Linux

At the same time
You nead an emulator. The emulators know to run Windows on linux are:

Free Software

 * QEMU - fast, working almost well ; see How to install Windows on linux with QEMU
 * KQemu is a graphical interface
 * boch - works well, very slow (100/1000 times slower)

Proprietary / Freeware

 * vmPlayer - will not work unless you already have a Virtual Machine; you need the paying version to create a virtual machine
 * VirtualBox - more simple to use, part of this software was recently released under GPL2 licence

Proprietary / Paying

 * vmWare

At asyncronous time
You can install Widnows on a different partition than Linux.

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