Macbook pro internet sharing to non apple with password ?

Hi there,
I have a MacBook pro, in my place I connect to the Internet through LAN cable, and I have 3 friends who I share the Internet with (Windows)
When I share my Internet with them I cannot put a password (40-bit or 128-bit) because when I do their laptops says password is wrong
So I leave it without one, and that gives me a big headache because my network is exposed to every one and I’ll have a slow Internet speed
I am searching for an answer since forever , Is there a way to protect my network ?
to have a password and let other non apple laptops access my network?

It hardly matters. The only security available with Internet Sharing is WEP, which can be cracked by anyone in a few minutes. Use a real wireless router with real security, or don't bother with security at all and accept the consequences.

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