Internet works only thru a proxy

[Accord Man]

Hi,

The problem is that I'm unable to access the internet. Everything was fine yesterday, and this morning it was dead.

I didnt install anything in particular.
I dont have any virus/trojan horses/worms/malware/etc..

When I enter a proxy in the Connection settings, the net works (IE, streaming media)! Outlook, ftp & direct connect do not work. And KAZAA works with OR without the proxy enabled..

A few days ago I downloaded the Speed Guide TCPOptimizer and I've switching between the "current settings" and "Optimal settings", regardless of that everything was fine for till today.. I didnt play with the individual settings..

Any suggestions?

thanks,
JP