How Old Is Your System?
For those who were curious to know this, or the ones who are now willing to know this, here’s how you go about it 
- Click Start –> Run
- Type cmd to open a command prompt.
- At the prompt, type systeminfo
Scroll down the list of information to the line that says System Up Time.
This will tell you in days, hours, minutes and seconds how long the system has been up.
PS: This command only works in XP Pro, not in XP Home. You can, however, type net statistics workstation at the prompt in Home. The first line will tell you the day and time that the system came online.
Posted by Rajat Jaswal