open a command prompt, that is go into dos, usually go to start, program files, accessories, then click command prompt. in that window type:
ipconfig/flushdns
hit enter wait for it to end
then type
ipconfig/registerdns
hit enter wait for it to end
then type
exit
that'll close the window.
then check to se eif the site is fixed, if not, restart your computer and it should be fixed.
WWS