Hi Tony,
I changed my PC last year for my AMD Athlon Dual Core 3800 and kept my older one for "experimenting"!
Anything I am not sure about I try out first on the old one and if it goes through OK, then I add it to my new one!
I sometimes spend best part of a day just trying out new downloads on the old one looking for possible problems.
My spare bedroom hasn't got enough room for the old one, it's so full of gear I bought long ago, no longer use, but can't bring myself to take it to the tip!
I count myself a TRUE Yorkshireman (with just a little scottish blood)
cheers