I never used XP,so cannot say from personal experience,but from what I hear,7 is much better,and very user friendly (always a good thing as far as computer as concerned!)that I can vouch for.I was running a desktop PC with 2Gb RAM,and thought it was OK,but as time went on and I got a new laptop with 8GB RAM,I saw the difference was staggering
.I did everything I could to the Desktop(pretty much what you have been told to do) and it never went much faster than what it was already doing.
Cos computers have been getting faster,I think technology has jumped on really fast in the last few years,so buying them and their parts is cheaper,so something that is only a few years old which cost hundreds is now slow and 'difficult' shall I call it
My desktop will never be fast,and maybe this could be the same?
Good luck with saving all the stuff you want to,double,triple check you have saved it before you delete,just to be 100%.