Ip address changes rapidly

[cousinschar]

Hi,

I have encountered something that I have never seen before. I am setting up a friend's new computer with PC Anywhere for remote access. It is a Dell Inspiron 531 that was purchased with Vista. After some horrible months trying to get s/w to run on it, we decided to take off Vista and install XP. Everything is working perfectly now, except the PC Anywhere.

While troubleshooting, I have found that this computer does not reflect the router's IP address when we go to www.whatismyip.com. For instance, the router's IP is 173.158.128.211, but www.whatismyip.com is 173.158.128.36. Then, when you refresh the screen it changes 173.158.128.59, then refresh and change again!

He has 2 other computers on the network and they both show the router IP when you type in www.whatismyip.com.

Why is this Dell computer not reflecting the correct ip and looping or changing so quickly?

I hope you can help...Dell, Dish network, and several other computer wizards have no idea.

Charlotte