Issues with my Mac Mini & a Linksys Wireless Network

I have Linksys WRT54GS router hooked up to a Sprint DSL modem. Attached to the router is my homemade PC a Pentium 4 3.06 GHz HT with a Linksys wireless card installed, another homemade AMD computer connected via Ethernet, and I am attempting to get my Mac Mini on board too. The network is set to 128 Bit WEP security with a password. Both of the PCs are connected fine getting good speeds. My issue is that on the Mac when I attempt to connect it does one of the following things: (1) deems my password as invalid, (2) says there is "an error joining (network name)", (3) when I change the WEP Personal to WEP 40/128-bit hex will not allow me to type more than one character, or (4) when I change the WEP Personal to WEP 40/128-bit ACSII it either allows me to type the password and doesn't allow me to press OK or won't allow me to type a password at all. I did not attempt the LEAP because I don't know of a User name, just a password. Any suggestions on this dilema? Any help would be greatly appreciated!
Mac Mini 1.5 GHz Power PC G4 // Homemade Pentium 4 - 3.06 GHz Windows XP Pro   Mac OS X (10.4.6)   2nd Gen iPod Mini 4 Gb Silver, 5th Gen iPod 30 Gb White

Welcome to the Forum
I found my Macs prefer using WPA encryption and they do this with ease. I had loads of issues when I first set up the LinkSys and attempted to use WEP, besides WPA is a lot more secure.

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