I had this previously as well. I reformatted my drive and then reinstalled and it worked like a charm. Allright here is my problem:
When I try to view sites using www.name.com I keep getting a dns error but when I use name.com without the www. for the same site, it works perfectly. Now the problems is when I try to login to sites with name.com they use the www.name.com configuration thus just giving me a dns error. Sites like www.cj.com and www.clickxchange.com are not working at all. Why does winxp keep on doing this to me? Is there a way to fix this?
Do you have a router between the cable modem and your PC. Do you have a PC with a different OS that you can hook up to the cable modem to test. You need to figure out if it's the PC or the connection before you go and reinstall the OS. Have you tried rebooting the modem, router and PC?
here's the funny thing. I tried pinging the sites with and without the www. function and EVERY single site was pinged successfully through the windows explorere program and my firmware program which is used by my router and is run through IE. Does that help in any way?