error 815 PPPoe WAN miniport

[slp]

Hi,

My internet has been working fine until 2 days ago when it suddenly stopped working. I am using Vista and direct ethernet connection from laptop to modem.

I have called the ISP (Comcast) and they have checked all the settings on my computer. The network connection is working properly, as I am able to connect to internet from another computer with XP installed. However, the two computers I have with Vista don't work, both getting an error 815 message.

ISP suggested I call Microsoft, as they have a note that this is a Vista patch issue, however Microsoft won't provide tech assistance until I have called the manufacturer. Both versions of Vista are OEM copies, but the manufacturers are different.

The laptop works fine using a different cable connection, I have tried resetting the modem, powering off everything, changing registry settings, deleting and re-adding the Broadband PPPoE network setting, and accessing the modem to add MAC addresses (but can't get in using 10.1.1.1 or 192.168.254.254).

Any suggestions greatly appreciated.