Macbook Pro and WEP problem

Hello guys,
Ive been looking for a solution to this problem for a long time. I have seen various variations of my problem but nothing exactly the same. But still I appologise in advance if this has already been covered.
Basically I bought a MacBook Pro back in late November and for some reason I cant connect to any network that has a WEP password. I had one on my home network and had to remove it leaving the connection open in order for me to connect. but now I am on holiday and I am having the same problem. I have the right password and everything but it just wont connect to it. I get a message saying "cannot connect to <network name>"...its quite frustrating.
What could be wrong? Any help would be greatly appreciated, or if you can just point me in the right direction that would be cool too
Thanks guys
Ross

My MacBook Pro had been working fine with my WEP encrypted wireless router until my husband "fixed" the router to work with his lame XP laptop. He reset the router and reinstalled it, then I could not connect unless it was set to WPA, and he couldn't connect until it was set to WEP. I finally figured out how to connect using the WEP. I have to open Internet Connection and instead of selecting my wireless network from the list, I have to select 'other', and then select my home network. Then I have the option to select WEP hex instead of WEP password. My password then works. I don't have to put a $ in front of it.
Now I have the problem of having to do this each time I turn on the MacBook, though. Does anyone know a way to change the default encryption for a wireless network so I don't have to go through this each time? I tried changing the preferred network settings, but, again, when I pick the home network from the list it does not recognize my password because it thinks that it is WEP password instead of WEP hex.

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