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Hacking a windows machine locally is easy as pie, you have a couple options.
1) Get a bootdisk , bootup the machine and delete sam.exe and sam.log from the winnt\system32\config folder.
This will change the admin password to nothing
2) Get a special bootdisk that changes sam passwords, there are a few of these, just search for one.
3) If your dad hasn't been patching the computer to keep it safe from the new worms and stuff floating around recently you can gain remote access and create a new user acount with admin privilages. I won't actually post the exploit code here or all the steps to do it, but search for MS03-026 (I think that's the related security advisory). It's called the DCOM RPC vulnerability. You could also check around for the new one, RPC DCOM Heap overflow, MS03-039.
Enjoy 
PS. All these methods work, I've used them 
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