Question : Cannot access google.com or yahoo.com

When I try accessing either yahoo.com or google.com, I get a listing of their Apache server file structure but not the web site. I can ping both web sites by name and IP addresses fine. I have the google toolbar installed on my browser, now when I tried searchng for any word in there, I get "a "page cannot be found" message.
Any idea on what could be happening?
Windows XP home Service Pack 2
Thanks
MaryG

Answer : Cannot access google.com or yahoo.com

Also, going to Windows update and using the "Malacious Software Removal Tool" may help also. It should be under recommended /critical updates.