Windows 7 help needed

Ok I have never really done this much.

But the thing I want to do is make a administrator account for my self only.

But the idea I have is this is not my laptop.

I would like to make a administrator account and only have my account affected to any changes I make to play games.

This is my moms laptop.

I do not want to mess with any of her settings she has.

Just my own.

I am computer savvy so use all the techno babble you want on me.

By the way I do know how make a admin account.But the idea here is to restrict one from the other if you get my meaning.I have plenty of space 500GB hard drive to do what ever till I move into my own place soon.

 

From command line possibly with admin privileges:

net user username password /add
net localgroup administrators username /add

I would go powershell, but I'll stop here. Powershell does make things easier in an AD environment, but not with local accounts, as seen here: http://www.petri.com/create-local-accounts-with-powershell.htm

And you did say techno babble. :major