Hey, I didn't read the file that was posted, so I don't know if this is a repeat of that.
Anyway, do you have .NET set up? (I assume you do since you have an ATI card.) And if so, do you have administrator passwords on all of the computers, or do you not bother? If not, set up the administrator password on all of the computers involved. Then, when you go to map a network drive, right click on the computer name you want to access and click Explore. It should prompt you for a username and password. Just connect as Administrator and use the pass you set up. If security isn't an issue in the house, check the box that says Remember Password." then you should be able to map whatever drive is shared and not have to bother with the passwords again.
Anyway, do you have .NET set up? (I assume you do since you have an ATI card.) And if so, do you have administrator passwords on all of the computers, or do you not bother? If not, set up the administrator password on all of the computers involved. Then, when you go to map a network drive, right click on the computer name you want to access and click Explore. It should prompt you for a username and password. Just connect as Administrator and use the pass you set up. If security isn't an issue in the house, check the box that says Remember Password." then you should be able to map whatever drive is shared and not have to bother with the passwords again.