Well one thing you can check to see if you have a dedicated server or VPS is by checking the System Properties. If you have a dedicated server then you will see more features such as Hard Drive Storage and Memory and if you have a VPS you will see less features.
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As far as I know, Virtuozzo is the only used windows virtulzation kernel. So, if you look in the C drive or My Computer (one of the two) you should see a file called "vzquota" that you arent allowed to modify or delete. If you see that, your on a vps