Our KVM VPS plans support almost any operating system that you may want to use.
We include options for many differnt Linux distros including CentOS, Debian, Ubuntu, etc in both 32 and 64 bit versions. You can also run other operating systems on our KVM VPS plans like FreeBSD etc if you provide us with a link to your .iso. Once your service is online, just open up a tiicket with tech support and provide us with a link to your .iso to mount.
If you definitly need Windows, you will want to check out our Windows VPS plans. These VPS plans run Windows and include a Windows OS License.