Yesterday, my brother asked me to look at his computer because he couldn't connect to the internet. I took a look and realized he had viruses and the best solution would be to reformat. I had an extra hard drive that was larger than his so I went ahead and just installed that one instead. Now, I can connect it to the internet and everything but when I do it keeps freezing. He has an old system that my cousin built like 8 years ago. The hard drive he had was only 20 gigs and the one I just replaced it with is 250 gb. Is there some compatibility issue that I'm not getting or something? Or could there be a virus in the RAM? I thought this would be an easy deal, but its taking me all day. Please shed some light.