Not connecting to a specific network

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http://askubuntu.com – I reviewed a lot of other post but nothing so far seems to work for me. My problem is similar to those that used to happen with wpa/wpa2 security and ubuntu. The thing is that my computer is having issues to connect to my wifi, but the security protocol that I'm using is WEP. On the other hand I know is not incompatibility between the chipset and the modem because the partition that still has windows connects without problem. Other computer that I have with ubuntu 12.04 and that one has no problem connecting. Whenever I make my computer connect to the wifi network keeps trying to connect wit (HowTos)