Hey compuease,
Read the following link:
http://en.wikipedia.org/wiki/Hosts_file
The host file can be modified by applications to inject an incorrect IP\hostname mapping.
I would open up <WINDOWS_DIR>\system32\drivers\etc
In there you will find a file called hosts. OPen it up with your favorite editor and hopefully you will find an entry for pokerforum.ca. If you do, wipe it out and save the file.
Hope this helps,
Dgangsta