Networking & wireless: There is an IP address conflic with another system on the...

There is an IP address conflic with another system on the...

I recently moved into a new apartment complex that includes free internet. As far as I can tell, the entire complex is one giant LAN, with internet service provided by GRU.net.

The complex is brand-new and I was one of the first people to move in. The internet worked fine for the first week, but my wireless router broke during the move-in so I've been using a LAN cable. Everything worked fine.

After everyone else moved in and filled up the apartments I have not been able to connect to the internet through the connection in my room (I am actually connected to someone's random wireless router right now, but the signal is weak and slow). When my Local Area Connection connects, I cannot get an IP Address. Instead, I receive the error message:

"Windows System Error
There is an IP address conflict with another system on the network"

For the heck of it, I ran ipconfig and got these results:
ipconfig results
Local Area Connection Status Screen

I know there are several threads already dealing with similar issues, but they all seem to involve a recently installed router in someone's home or workplace. I have no access to the routers or switches in my network so I doubt that I'll be able to make any changes to them.

Any help that could be provided would be appreciated greatly.

System Info:
Dell Latitude D820 Notebook (about a year old)
Windows XP Service Pack 2
Network Card: Broadcom NetXtreme 57xx Gigabit Controller