Resetting Network Profile

[Drazick]

Hello.

I have Windows 7 64 Bit installed.

At first I created the Administrator User (Let's Call user A).

Later I gave the computer to my dad so I created user B and gave it Administrator permissions. Then I deleted User A.

All other things remained the same.

Since then I can't access any other computer on the network (Private, All Sharing settings has been applied in a way to allow other to access the computer on PC computers in the Network).

Moreover some settings (Firewall exception for instance) of the Previous user can be deleted know.

I guess it has something to do with the way Windows logon into other Windows PC's.

Is there a way to reset all the Network Settings in order to reconstruct it as User B is the only user ever logged into the computer?

Thanks.