XP computer won't connect after upgrade to 7.5.2

We have multiple Apple devices which connect seamlessly with Airport Extreme. However, it seems like after the latest firmware update to 7.5.2, our older XP laptop (Toshiba) will not connect. It sees the SSID but will not connect. Our 2007 Dell XP desktop also had this issue, but when I changed the security on AEBS to WPA2 (from WPA/WPA2), the desktop ws able to connect.
If I unsecure the network, the laptop can connect. It is much older (2003 or so). Funny thing is, it did connect fine using WPA/WPA2 until this past week.That's why I think it was the AEBS firmware update.
I'm thinking about setting up a guest network for the laptop alone and leaving all other devices on main network. I would rather not have guest network unsecured. Is it possible to keep main network as "n" and use WPA2 and set guest network to "a/g" or wahtever would allow me to use Transitional WEP? I would want to keep the main network as "n". I do not want to downgrade it to "a", "b", or "g" for this one laptop that is used occasionally.
If my only option is to leave guest network unsecured, will my main network (with banking info etc) still be secure?

DaveF333, welcome to the discussion area!
The available security choices for the Guest Network are:
WPA2 Personal
WPA/WPA2 Personal
None
Security on the Guest network is independent from the Main network, so you could have security set to None on the Guest network and it would not affect the security on the Main network
If you are in a mood to do some exploring, check out the following:
Open AirPort Utility - click Manual Setup
Click the Wireless tab/label just below the Advanced icon
Hold down the option key on your Mac while you click on the Radio Mode selection box and you will see an expanded list of choices.
Choose 802.11n only (5 GHz) -- 802.11n/g/b
Now hold down the option key again and click on the Security setting and you will see a choice to establish WEP Transitional Network. This setting allows WPA devices to connect using the higher security WPA and WEP devices to connect using WEP. You might want to give that a try.
You can also experiment with a number of different Radio Mode and Security combination settings to find other WEP Transitional Network choices. Just remember to hold down the option key when you click on the selection boxes.
Pretty neat, huh?

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