The streaming portal expect to see WOW64 in the User Agent String from the browser. If there is not WOW64 in the sting then the streaming portal thinks the system you are coming from is an x86 system.
To view your current browsers User Agent string you can view it through the developer tools and run a network trace from IE to see what the agent string is being sent, or you can also go to http://www.useragentstring.com/
A sample of a User Agent string below:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0