[Oneironaut]

You don't need a registry cleaner, virus protection, spybot blasters, etc for your Mac. You also don't need to defrag it. In fact, you don't need to to much of that kind of maintenance at all.

I would just get a copy of Windows, a copy of VMWare Fusion and run Windows from within your Macbook Pro. You'll need to get a registry cleaner, virus protection, etc for your Windows partition, but if something infects it, it won't have any effect on OS X. Just back up all your files, delete the Windows partition and create it again and you'll be all set.

I have a Windows desk top at home that I haven't used in months because I've got everything I need on my Macbook Pro. Not sure what I'm going to do with my old box, but one thing for sure, I'll have a little more room for more Mac peripherals!