I’ve read just yesterday Wikipedia’s page on Oxytocin, and it states that it delayed symptoms of Alzheimer’s disease. Oxytocin is released during and/or after sex. This could be simply that people with Viagra prescriptions are more likely having more sex, and so more Oxytocin being released by the brain, and delaying Alzheimer’s.

My daily PC is an i5-3570k and it’s very quick in Kubuntu (that’s Ubuntu with KDE as a graphical environment). I think I have “only” 8 GB RAM and it’s quite enough for my use.

If you’re really not sure and don’t want to break anything, I’d suggest installing some different OSes in virtual machines and try on that first. That might be a learning curve by itself, but you won’t take your computer as hostage for your beginner’s errors.

There are more user friendly OSes than others. I’d go with a Ubuntu or *buntu flavor just for the fact that there’s a lot of beginner friendly websites, tutorials and forums.