Sounds like a DNS Cacheing problem.
If you can’t get to the site, reboot your PC, power cycle (off then on) the router/modem, restart and see if it works.
if you still can’t get there go to windowssystem32driversetchosts, see if there is an entry for your domain pointing to a different domain, possible you’ll see:
127.0.0.0 http://www.3dpokerpkr.com
localhost http://www.3dpokerpkr.com
those would force your machine to look locally no matter where you DNS points. you can remove those lines or put a # sign in front to comment them out
#127.0.0.0 http://www.mydomain.com
that line will be ignored as comment.
good luck.