1. - use the following command to install the desktop
# yum -y groupinstall "Desktop" "Desktop Platform" "X Window System" "Fonts"

# yum -y update

# yum -y install nx freenx

# shutdown -r now
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2. - take the key code vps
# cat /var/lib/nxserver/home/.ssh/client.id_dsa.key
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3. - download & install NX Client for windows 
link : https://www.nomachine.com/
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4. used "NX Client for windows" to connect with your Vps