依赖关系：
rpm -ivh dkms-2.1.0.1-1.el5.noarch.rpm
（单独下载）
yum install SDL
yum install kernel-devel
rhel6还需要安装qt,qt4,qt-x11
安装
[root@rhel5 Desktop]# rpm -ivh VirtualBox-4.1-4.1.2_73507_rhel5-1.x86_64.rpm
warning: VirtualBox-4.1-4.1.2_73507_rhel5-1.x86_64.rpm: Header V4 DSA signature: NOKEY, key ID 98ab5139
Preparing... ########################################### [100%]
1:VirtualBox-4.1 ########################################### [100%]
Creating group 'vboxusers'. VM users must be member of that group!
No precompiled module for this kernel found -- trying to build one. Messages
emitted during module compilation will be logged to /var/log/vbox-install.log.
Stopping VirtualBox kernel modules [ OK ]
Uninstalling old VirtualBox DKMS kernel modules [ OK ]
Trying to register the VirtualBox kernel modules using DKMS [ OK ]
Starting VirtualBox kernel modules [ OK ]
[root@rhel5 Desktop]# VirtualBox
#解决中文乱码，安装以下软件
rpm -ivh wqy-bitmapfont-0.8.1-7.noarch.rpm<单独下载>
usermod -a -G vboxusers root《不用操作》
进入图形界面，安装相关虚拟机！
