I tried using TCP Optimizer to change the MTU setting for a Vista
computer I was working on, but the modem did not appear in the drop
down list of adapters. Only listed were the wireless and ethernet
connectors. I moved the slider switch from 3000 to 56K and went to
Optimal settings and saved, but the MTU of 576 did not take after the
reboot.

Where do I go in Vista to optimize the internet connection for a
computer that most of the time uses the 56K modem to access the
internet?

Thanks