USB Modems

I used my lg mobile as a usb modem to connect to internet with WinXP SP 2. It
worked fine. Bt with Windows Vista in my new laptop I can't use it. Modem
drivers were successfully installed. I can successfully query the modem. Bt
when I tried to connect to the internet it pops up a box saying "Failed to
set network entry". I don't knw wat it stands for. I tried disabling IP V6
but it's still da same. Can sum1 help me resolve dis.
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Thanks

Ranjeewa