Hey Chris, if you're on windows you might try a "command prompt" and type in this without the quotes. "ipconfig /flushdns" a restart will likely do the same. I hope that helps.
if you behind a router rebooting the router sometimes resolves this.
another you can do is just change your ISP DNS in your local PC network settings to like google DNS or opendns
and see if you can resolve your site on your machine.
after 72 hours you can go back to your defaults
if you dont make any changes..only thing that is gonna work is
DNS propagation time takes 24 to 72 hours to resolve world wide when a change is made.
dont worry nothing wrong with your pc.