Can't connect to wifi after resetting router

Hello,

I reformatted my laptop today, and because of that I lost the password for the wifi connection here. Someone threw out the booklet that had the password written down, so I reset the wireless router and created a new password. However, now my laptop can't connect to the network. Actually, apparently it can connect, but I'm getting one of those "limited or no connectivity" messages.
There was no mistake in entering the WEP key on my laptop, because I tried making the connection open... and I know it's not my laptop either, because I was able to connect to my neighbour's network without any trouble.
Does anyone have any suggestions? I'm using Intel PROSet Wireless on a Dell Inspiron 6400, and the router is a D-Link DI-524. Thanks in advance!