Problems after SID number change

Ok. I changed my SID number last night and after I rebooted most of my stuff was gone. Well, I dont know if its gone or it is just not available to me because Im not able to log in to my my administrator account. I am not able to perform most functions because I dont have the rights to do pretty much anything.

If I get my stuff back, that is cool, but I really need to start windows 7 over so I can get started again.

Is there a way that I can fix this or somehow restart my system?

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