That because Web Wiz Forums doesn't run on GoDaddy servers.
They are listed on the page below:-
http://www.webwiz.net/webwizforums/kb/non_supported_webhosts.asp
Also they do not have the IIS 7 Rewrite Module installed on their IIS 7 servers, hence the 500 error you get. if you do a search online allot of people are finding that GoDaddy have not installed this module (which does not come with IIS 7 as standard) on their Windows 2008 IIS 7 servers.
You may want to look at our own Hosting Packages which are on Windows 2008 R2 IIS7.5 and do have the IIS 7 Rewrite Module installed as well as ISAPI_Rewrite.
On production websites we find that the IIS 7 rewrite Module can course the application pool to recycle when under load coursing session issue, so I would recommend using ISAPI_Rewrite instead as it more features and is more reliable.
Our Windows 2008 R2 IIS7.5 Hosting packages can be found on the page below:-
http://www.webwiz.net/webhosting/