AirPort and MacBook Pro Internet Issues

I have two unrelated issues with my network set-up.
My ISP is AT&T U-verse, however I use an AirPort Extreme as my main router. The Extreme network is extended by an AirPort Express so that a PC on the far side of my house can receive the connection. In this part of the house, my MacBook Pro can receive the signal, but the PC running Windows 7 with a Linksys Wireless-G USB Adapter will not connect. This is a new problem, as this computer used to be able to connect (but with a weaker signal than my MacBook) up until about two weeks ago.
The second issue is with my MacBook Pro (2011 model running Lion). Sometimes, when the computer wakes from sleep, I am told that my IP address is in use by another device on the network and that I should enter a new IP address (no idea how to do that). I am unable to get on the Internet when this message is displayed and I have to reboot my AirPort Extreme in order to get back online. I think that when my MacBook wakes from sleep, it is being duplicated on the network because once I was told that the Shared name of my computer was already used and that it would change to Anthony's Macbook Pro 2. It also seems to only happen when the MacBook falls asleep while still open.
If it helps, these are the devices connected to my network: MacBook Pro (2011, OS 10.7), iMac (2006, OS 10.6.8), PC (Windows 7), PlayStation 3, Wii, iPhone 3G, iPhone 3GS
Thanks in advance!

Also, just found out that the two iPhones also will not connect to the Express, just my MacBook.

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Disclaimer: Apple does not necessarily endorse any suggestions, solutions, or third-party software products that may be mentioned in the topic below. Apple encourages you to first seek a solution at Apple Support. The following links are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use the information below at your own discretion.
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This is the 1st version of this tip. It was submitted on August 14, 2009 by a brody.
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Please put in:
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