I just installed windows xp pro on my system but some internet sites will not load. What do I do? Answered

I literally installed windows xp pro sp2 on my desktop last night. The next thing I did was install the driver for the wireless adapter. That is it, nothing else is on the computer. Then when I go to certain internet sites the browser either freezes, slows way down, or will only show part of the page. What do I do?