Enter network password, but computer still needs password. Can I get around this?

Our neighbors moved and I found a laptop in their garbage.(Don't ask) I actually did score alot of Xmas decorations and a Dell XPS M1210 laptop which fired up. It has Windows XP on it, it showed 2 users, 1 was password protected and the other wasn't. So I was able to check some things out, no personal data or documents were on there. The computer picked up that there was a wireless network in my house, so it asked for the network password and tried to connect. But it wasn't able to through the Intel(R)Proset wireless program. It said something a password needed to connect to a network. Is there a way to get around this? What about using the computer in general, just go under the other user? Of course with no network connection, not sure what to do? Do I end up clearing the whole hard drive? But then I loose my OS? Any help would be appreciated, haven't really had to deal with issues like this. Thanks

 

Have you tried using the built-in Windows wireless program? I think it's called Wireless Zero.