How can you enlighten me in changing my Windows system to Macintosh system?

Thanks for that tip, I was positive myself that Macintosh was penetrable with bugs and viruses too.Its just that all the people I knew who had Mac OS swore to me that there is no way a virus can penetrate this system.I found this too impossible. Too bad i really need Windows for Autocad which is not compatible with Mac OS.

It's true that Autocad discontinued Mac software many years ago. I don't know the history of that but I assume that it was because they couldn't get Apple approval for their software. It seems illogical because, certainly twenty years ago, the Mac was a much better graphics machine than the PC. You might be interested in these sites, especially if you are thinking of switching to a Mac for other reasons: http://www.autocadformac.com/index.pl?id=2189;isa=Category;op=show http://www.avatech.com/solutions/general-design/product-details.aspx?product=89 Of course, viruses and other malware are really only a significant problem if you are using the Internet. A standalone machine (not connected to the Internet) can only be infected through files exchanged with other machines and that is less of a problem today than it used to be. By far the most common file viruses are those in Microsoft documents (Word, Excel, Powerpoint, &c) which can include malicious macros and VBA code. Depending on the nature of the code, this could be equally dangerous to PCs and Macs.