First let me say I've done plenty of troubleshooting and will try to explain as clearly and as much as I can. Please bear with me.
I have a client's computer who uses dial-up and Windows XP. The problem is when I connect to the dial up ISP. IE or Chrome will not browse the internet. It says page cannot be displayed. but if I use firefox on the dialup connection it works. Sounds simple enough there has got to be something wrong with the proxy settings or something...well, that's what I thought here is the weird part.
When connected to the LAN in my office IE, Chrome, and FF all work.
I upgraded to ie8 and the issue still happens. How would you go about troubleshooting this issue? What should I do next?