[humanpuff69]

i have only 3GB of RAM. i think not enough for it. because in my PC i am using 6GB and some times its getting slow.

openvz cannot do dual boot . and even if you have kvm vps you can only use it one of the time
if you have lot of ram on your pc (NOT VPS . except if you want to get suspended) you better use virtualization like vmware or virtual box for example if you want to do is just try the os or doing something lightweight . only fo fualboot when you need to use all the power