I like sneaking around the rules...
Restart the computer, go into safe mode, log in as admin (unless they passworded it, which I doubt) and make a new account in windows and password it safe from them.
Do this in the admin user from safe mode.
If you want to keep the old account and leave your parents non the wiser that you have disabled thier shit you can also open up the CMD and type the following:
"net users"
<this will display all users>
"net user username *" - Replace the username with the account you want to change.
Then it will ask you what you want to change it to, it should then allow you to use the user that has the program that is fucking your stuff about.
Hope it helps ya cheat your parents... you are 17 so its kind of shitty, you brought the fucking thing so wtf is it their bussiness?