From the Start button, select "Run...", enter "cmd" and press enter.
To enable PPP logging, issue the following command in the cmd window:

• netsh
• ras
• set tracing PPP enable
• exit

To disable PPP logging, issue the following commands:

• netsh
• ras
• set tracing PPP disable
• exit

The log file will be created in the %SystemRoot%\tracing directory and will be named PPP.LOG On my Win2000 box the system root is \WIN2K yours may vary.