Checking Windows Server 2003 Reboot in Event Viewer

event viewer is the best way, just look for when the services all give a successful start

Yeah, You can check event view and there is information like when DHCP entered the running state ect..

Or you could Open Notepad.  Paste the Below Code in.  Save it as uptime.vbs - Now double click the file.  This file will tell you how many hours the computer has been running for since last reboot.

' Check for computers last reboot
 
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
    & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colOperatingSystems = objWMIService.ExecQuery _
    ("Select * from Win32_OperatingSystem")

Dim uptime
 
For Each objOS in colOperatingSystems
    dtmBootup = objOS.LastBootUpTime
    dtmLastBootupTime = WMIDateStringToDate(dtmBootup)
    dtmSystemUptime = DateDiff("h", dtmLastBootUpTime, Now)
    uptime = dtmSystemUptime
Next
Function WMIDateStringToDate(dtmBootup)
    WMIDateStringToDate = CDate(Mid(dtmBootup, 5, 2) & "/" & _
             Mid(dtmBootup, 7, 2) & "/" & Left(dtmBootup, 4) _
                 & " " & Mid (dtmBootup, 9, 2) & ":" & _
                     Mid(dtmBootup, 11, 2) & ":" & Mid(dtmBootup, _
                         13, 2))
End Function

WScript.Echo uptime