1) open up \etc\yum.repos.d
2) make a file called virtualbox.repo
3) paste into it:

[virtualbox]
name=Fedora $releasever - $basearch - VirtualBox
baseurl=http://download.virtualbox.org/virtualbox/rpm/fedora/$releasever/$basearch
enabled=1
gpgcheck=1
gpgkey=http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc

4) Save and close

5) rpm –import oracle_vbox.asc

6) install ONE of the dependency

yum install gcc kernel-devel kernel-headers
 ## PAE kernel users install ##
yum install gcc kernel-PAE-devel kernel-headers
 7) yum list VirtualBox*
8) yum install VirtualBox-XXXXX
9)Add VirualBox user to vboxusers group 
usermod -a -G vboxusers user_name

10) VirtualBox (to start it)