There is an "uptime.exe" for Windows. I actually installed it on one of my windows computers a while back. Do a search for "uptime.exe." Anyway, my Linux server had an uptime of over 350 days until I brought it down to add another hard drive. The last time it went down before that was due to a power failure. It isn't a "mission critical" server, just a toy for me and some friends to play with.
Current uptime is:
[dishawjp@ip4 dishawjp]$ uptime
7:05pm up 51 days, 15:51, 1 user, load average: 0.00, 0.00, 0.00
Ok, only 51 days so far. Give me another few months. It'll look better then.
Jim