Note. I do recommend a machine of at least 1 gigahertz in speed and at least 512 meg or ram, but more is better so other programs do not feel slighted.
Once you have done this you can go back and in the install cd for Reatos and have Reactos installed more permanently.
Let me know if you have any qiestions..
Step 1: Installing the virtual machine software
You will be asked for a password and then you can choose packages. Type in qemu in the quick search box. Then all the packages having to do with qemu will appear.
Choose qemu and qtemu ( you may have to page down on the packages to see it.
Then click on apply. Those items will be installed.
Hint you can also:
sudo apt-get install qemu qtemu
to achieve the same thing.
Step 2: Get the software to test the virtual machine.
Step 3: Getting it going
You should get a window as pictured below.