In VPS or Virtual Private Servers, resources are not shared but reserved for each user. VPS comes with full administrator access. You can install software, configure the server as per your wish. Windows VPS can be accessed via Remote Desktop Client app. and VPS plans has private IP address.

Yes, Windows VPS comes with full administrator access. You can install the software you want

Yes, you can do encoding / ripping / Bitcoin Mining in your VPS Plans.

Yes, you can reboot your VPS whenever you want through VPS panel provided to you.

Yes, Windows VPS can be used to host websites.