One quick way to protect your computer is with Brando’s “USB Wireless Lock”, it boasts a transmitter that locks up Windows 98SE/2000/ME/XP as someone nears. If an intruder decides to smash the receiver into tiny bits and pieces, a password is still needed to unlock the computer. The included software lets you set the timer control for up to 8 hours of monitoring. It’s available here for $27.00.
