Insane! I bet you can’t beat that.
To be fair, that isn’t a traditional Windows computer. It is a NetWare 3.12 file server that was put up on September 23, 1996 and never shut down or restarted since then, until it was recently taken down due to bad hard drives. I can’t imagine someone doing the same with a Windows (or Mac OS X) computer. At least not one that is regularly used. I’m not sure about Linux. Maybe.