You can install the OS by yourself on VPS Management Page at the Manage tab.

Linux server username is the root and the password has to be set up by yourself on your VPS Management page.
Windows server username is Administrator and the default password is Plian8tua
Windows Home username is Admin and the default password is Plian8tua

Linux/Windows KVM, incase of you forgot password and has to be reset at VPS Management >> Advance Control Panel >> Open Control Panel >> login https://vcp.paidooserver.com >> manage >> Root/Admin Password.