If you want to protect your computer data after a period of time to inactivity you can choose to lock the PC.
To lock a computer in a domain environment
Press CTRL+ALT+DELETE.
Click Lock Computer.
Windows displays the Computer Locked dialog box. Your system is now locked, preventing everyone except you or a system administrator from unlocking your system and viewing any open files or programs.
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To unlock your computer, press CTRL+ALT+DELETE, type your password, and then click OK
ARTICLES IN HOW TO LOCK COMPUTER WINDOWS XP CATHEGORY
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