802 1x authentication in my university

Hi In my University I connect to the wirless network with 802.1x authentication. I have no problems in XP, but in Vista it´s always asking for the authentication details, I enter the user and pass, but it continues to ask. The 802.1x authentication type is PEAP and needs a certificate, with secure pass, (EAP-MSCHAP v2). My wireless card is MSI PC54G2 with the latest drivers. Can anyone help me? Thx