Windows laptops can't connect to Macbook Pro shared internet when WEP security is on

As the title states, my Windows laptops can't connect to Macbook Pro shared internet when WEP security is on.  My iPhone has no problem asking for the password when I try to access the shared internet my MacBook Pro on Mountain Lion is sending, but my Samsung Slate on Windows 8 sees the network and only succeeds in connecting when no password is required.  When security is on, it just tries for a moment and says it can't connect to the network without ever prompting me for the password.  The same thing occurs on my Asus Netbook running Windows XP.  Since all the reviews about OS X's internet sharing mentions "any wifi device" can access it, I haven't assumed it's only compatible with Apple products.  I want my MacBook Pro to save me from needing an external router.

I would post a new question, outline the specific problem you are having and skip all the extra. Outline any steps you have taken already to try and solve the problem. Post the question in the forum most likely to have followers who can answer your question. Give your topic a good title such as: My MacBook Pro cannot connect to my WEP-enabled PC.
Provide any hardware information that may be relevant such as the make and model of your router and method of connection - wired or wireless.
I'm no authority, but have you tried using WPA2/Personal on your PCs? This method is most compatible with Macs.
If the WEP password is a hexadecimal password then on the Mac you need to preceed the number with a $ sign or the hex digits, 0x.
These links may be useful:
AirPort- Joining an encrypted WEP or WPA Wi-Fi network
AirPort Express- Difficulty joining 3rd-party network that is using WEP

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