Can't Connect Properly to Router After Successful Airport Express Setup

Hello - this is my first time posting here, but I had a weird issue I was hopeful someone could assist with.
Basically, I was having a lot of trouble setting up my Airport Express to join my existing network to steam audio to a set of speakers. After trying a number of permutations and searching on the internet, I found out that when selecting to join my home network I needed to select WEP-40 rather than WEP-128. Once I did this, it worked!
Unfortunately, the only issue now is that my PC laptop (I'm using a Mac desktop)...has trouble connecting to this same router for my home network. I am able to get it to connect, but only when I change the "Network Authentication" in the Settings to "Open" from "Shared" (which it seems to have been at previously when I could connect before Airport setup. When I do this though, the Wireless Network Connection area says that it's "Not Connected", but it is connected. Now, this laptop can connect to all other networks no problem, as well as other devices can connect to my network fine. I would be able to deal with this minor annoyance, but it does seem that the network will drop from time to time now, where it didn't before.
Very appreciated if you made this far and followed along - I'd really like some help with this issue. I am very, very confident it is directly correlated to the set up with the Airport Express, as this became an issue immediately following getting it connected.
Thanks!!
David

Welcome to the discussion area, dgbruce!
Your post did not indicate whether you had performed a full power cycle on your network. You should always do this whenever you make any changes on your network. If you have not already done this, follow this procedure:
Power everything...all devices...down, order is not important.
Wait a moment, then start the modem and let it run a moment or two by itself.
Then, start the next device connected to the modem the same way.
Keep starting devices until you have everything powered back up.
What are your results?
If no help, can you tell us if you made any changes to your main router? If no, power down the AirPort Express only. You are now back to your original condition. Can the PC connect now?
If no, then the connection issue is between your wireless router and the PC (because the AirPort Express is not even on the network)
If yes, and the PC connects correctly now, power the Express back up and watch for any changes. What are the results?
Message was edited by: Bob Timmons

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panic(cpu 0 caller 0x000A8800): Uncorrectable machine check: pc = 000000003931288C, msr = 0000000000149030, dsisr = 40000000, dar = 000000003A207F7E
AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000
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0x00095138 0x00095650 0x00026898 0x000A8800 0x000A7A90 0x000AB780
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PC=0x3931288C; MSR=0x00149030; DAR=0x3A207F7E; DSISR=0x40000000; LR=0x39312858; R1=0x2285BA10; XCP=0x00000008 (0x200 - Machine check)
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0x002D124C 0x393314AC 0x39332774 0x002EB838 0x0008C6A4 0x0002921C 0x000233F8 0x000ABAAC
0x00000000
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com.apple.iokit.AppleAirPort2(405.1)@0x392f4000
dependency: com.apple.iokit.IONetworkingFamily(1.5.0)@0x386e6000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x32922000
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Can't Connect Properly to Router After Successful Airport Express Setup

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