A. Windows XP and later include the systeminfo utility. When executed, it shows a lot of information about your system, including the system's boot time. When I ran the utility, I saw:

Host Name: SAVDALWKS01
OS Name: Microsoft Windows 7 Ultimate
OS Version: 6.1.7600 N/A Build 7600
OS Manufacturer: Microsoft Corporation
OS Configuration: Member Workstation
OS Build Type: Multiprocessor Free
Registered Owner: localadmin
Registered Organization:
Product ID: 00426-065-0254163-86023
Original Install Date: 8/7/2009, 11:22:13 AM
System Boot Time: 1/27/2010, 3:16:34 AM
System Manufacturer: OEM
System Model: OEM
System Type: x64-based PC
Processor(s): 1 Processor(s) Installed.
\[01\]: Intel64 Family 6 Model 26 Stepping 5 GenuineIntel ~2106 Mhz
BIOS Version: Phoenix Technologies, LTD 6.00 PG, 11/25/2009
Windows Directory: C:\Windows
System Directory: C:\Windows\system32

(Text bolded for emphasis)

In Windows Vista and later, you can also launch Task Manager. Up time is displayed at the bottom right of the Performance tab.

Click to expand.

There are other, longer ways to check the up time. You can check when key services, such as the workstation or server services, were started using the commands

net statistics server

or

net statistics workstation

and looking at the second line, which displays the date the services started (the time of the boot), as shown here.

Workstation Statistics for \\SAVDALWKS01


Statistics since 1/27/2010 3:16:56 AM


Bytes received 3823054
Server Message Blocks (SMBs) received 12340
Bytes transmitted 22773081
Server Message Blocks (SMBs) transmitted 12362


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