Cannot visit certain websites.
My problem is that I cannot visit certain websites (booksamillion.com, and any .edu pages). This happened suddenly. They do not work on either Safari or Firefox, however I can visit them on my Wii which is on the same wireless network as my Macbook. The error message that comes up tells me that Safari cannot find the server of those sites. I have no trouble visiting other sites.
I have repaired disk permissions, reset Safari, emptied the cache, deleted cookies, unplugged my router, checked my firewall, and now I'm begging for help.
Any suggestions would be greatly appreciated.
MacBook, Mac OS X (10.5.8)