I have always owned a PC. My PC's are always having issues and everybody I know has a Mac and loves it. I was looking into getting a MacBook pro and I im a bit confused. Since I have always had windows, all of my programs are only windows compatible. I am going to purchase a program that will let me run OS X and Windows 7 on my Mac...so I figure that my Mac may need to be a bit "beefed" up to run both of them side by side. I was looking into getting the MacBook Pro 13" 2.8 GHZ dual core i7 and beefing it up to 8 GB of RAM. But, I was also looking at the 15" 2.2 GHz quad-core core i7. Does the dual core vs. the quad core make a noticeable difference in speed? I don't want to spend a lot more money on something that wouldn't be worth it. Also, what are a couple programs that you would recommend for Mac (such as virus protection, editing, word documents, etc) I'm completely clueless!! Thanks!