Honestly .. don't try these at college, if you get caught you may be charged and punished......
Anyways ....... if you log in to some admin account in XP, then open regedit, right click on HKEY_LOCAL_MACHINE , click Permissions, select SYSTEM and "deny" access.
repeat this for HKEY_USERS, next time the computer won't boot............
This may harm your computer So try this at your own risk.....................
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