CoolTimer

Cool timer will tell you how long it has been since your computer was booted.

CoolTimer  Review

Cool Timer 98 is a free for home use utility for Windows 95, 98, ME, NT, 2000 and XP. It adds an icon to the system tray that informs you of how long the system has been running, broken down into days, hours, and minutes. This utility can be very useful to system administrators who must know how long their machine has been running.