Got another even weirder one too since trying to go wireless! Since I installed the linksys wirless network card, none of my three 'dial-up' connections work. My Vodaphone GPRS connection, for example, appears to connect to the gateway, but none of my internet programmes can get anywhere, even if specifically asked to use that connection from 'internet options'. Linksys say 'it has nothing to do with us'.
Again, I would love any suggestions.