Well, one thing you could do is to diasable any applications that browse the internet (ie. internet explorer). How you would do this is in the registry. Run regedit.exe and go to this key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Make a new DWORD value called "RestrictRun" with a value of 1 (enabled, dont allow applications) or 0 (disable, allow applications)
Then, under:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\RestrictRun
Make string s for each of the programs you want to disable, for example:
1 REG_SZ "iexplore.exe"
2 REG_SZ "netscape.exe"
3 REG_SZ "notepad.exe"
4 REG_SZ "wordpad.exe"
etc.
-Matt Snead