With all due respect to soybean, there is nothing that ccleaner does that effects performance.
You said the pages load slowly then you said the computer freezes. Those are two entirely different issues. Please take your time and explain IN DETAIL exactly what is going on. Also, has it always been this way or did it start recently? If the latter, what is new or different since the last time everything worked properly (ie, new hw, new sw, virus, error, etc)?