can't get to c:\

ok, i'll give you some more info if that'll help.

i cannot:
-access my documents
-access c:
-access command prompt
-install anything

i've tried:
-using IE, entering c: (gets restricted message)
-using windows explorer, entering c: (gets restricted message)
-using a shortcut to c: (gets restricted message)
-using windows help (gets restricted message)

i can get to the part where i can allow/deny things, but all the "allows" are blanked out. any way to get around this, short of acquiring an admin account? that's pretty impossible, seeing as how only the IT people have them. teacher accounts don't have access like that.