Computer question

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1. I'm running out of physical memory do I have to upgrade my hard drive? To what? 2. Do I have to boost my memory? I have 1GB at the moment 3. When on the internet how do you fix page errors? 4. When I access Yahoo messanger this message comes up - 'Your current security settings prohibit ActiveX control on this page. As a result, the page may not display correctly' I've gone into Internet Properties and into Security settings and allowed ActiveX controls but the message still comes up. 5. Any general tips for the computer and internet Thanks guys!