u can use this tricks to get some access to the internet of ur college or school also u can get access to the control panel and regedit ,if it was disabled by
ur school.

to do this first when u r logging on a pc , after u put
the user name and password and hit enter ,a rectangle
welcome screen will come .immediately pull out the
network cable i,e LAN CABLE ...
by doing that u can log on without any restriction
bcos the pc was not able to download any settings
from the server. now u have access to the control
panel and the regedit .
now to enable the internet connection go to
"internet options" click the 'connections' tab ,then
click LAN settings , click 'proxy' and in the box where
we can add those websites names that bypass the
proxy server, change them according to ur wish.apply
then and restart the pc. now get someone elso to log
onto that pc ,bcos if u'll log in it will load the cached
settings from ur previous log in,then after the other
person logs in, everyone that logs in after that will
have internet settings u specified..
this tricks only work in win 2000 and xp

by this tricks u can get access to regedit,
msconfig,command, virus scanner , or u can also install
trozen or virus