Read page 123 of the September 2003 PC Advisor for full explanation of tuning broadband connection using ping commands in a command window. I assume you do buy the mag as well as use it's website!!!!!!!!!!!!
If it is there then it looks like you have a variable problem. Right click My Computer, Advanced tab, click Environment Variables. Under System Variables look for 'Path' you should see the path to that directory, if there is no path shown double click on the word path and it will open a box above, type this into the variable value box