You need to update OpenCL. Easiest way would be to update your graphics card's drivers, or click one of the below links.Also, you need to make a "worker" account for yourself and log in as "mc77.me" or whatever you make it's name.
When I install the Catalyst update I get a package error.
It keeps getting better and better.I updated and found out why it didn't work.
No OpenCL support. :C
Radeon HD 4550, why you fail me?
Which brings me to another unrelated question, what graphics card should I buy? I'm don't have much money and I need a card that will run on a 250 watt PSU