Download the fedora x64 rpm from
www.virtualbox.org. Once downloaded you can go to a terminal as root and do the following:
1. rpm -ivh 'virtualboxrpm file name'
2. Make yourself a member of the group vboxusers.
Run Virtualbox and it is pretty easy to add a new virtual machine and load windows. If you need any other details, we can give them to you.
Virtualbox is very reliable and you can even run Windows in seamless mode.