This may sound stupid, but why not simply explain to you mom why you want access to the PC? After reading this thread (and others from before) I get the gut feeling that your mom has big reasons to restrict your access and that she has big reasons for not trusting you or whatever.
Doing all this stuff will not do you any good in the long run, as she will find out about it and she will not be happy. Then what? Grounded? No computer for a long time?
Talk to you mom about it all... Say you need a PC for homework and don't wanna mess up her computer (as you like to "experiment" also). If you're lucky (and behave
) you maybe can even get your own computer in the end which you could mess with. Afterall, it's the holiday season...