Windows XP A to Z - http://www.softwaretipsandtricks.com/windowsxp
View System Uptime
http://www.softwaretipsandtricks.com/windowsxp/articles/154/1/View-System-Uptime
Super Admin
 
By Super Admin
Published on 02/23/2005
 
To view the amount of time that XP has been running with out rebooting or restarting the computer

View System Uptime

1) Open the Command Prompt (located under Accessories)

2) Type systeminfo

3) Once the system has finished gathering the information, scroll up and the time is displayed in the System Up Time field.

As you can see, running systeminfo also gives a lot of useful information.