basically David, if you are running XP you cannot upgrade to W7... You have to do a fresh install, and therefore lose a lot of your little apps etc that you probably don't know where you got them from....
You can upgrade from XP to vista, but upgrade is not really the word there is it??
W8 is being replaced this year (according to rumours) as it is not a viable system, due to lots of customer complaints..
Ok Hector - that is a pain. Not knowing the specifics I can't say how difficult the upgrade path might be for individuals, but it must be possible, somehow.
Personally, I've always hated the Windows way of doing things. I ran Linux (personally) for many years, but had to use XP professional. While using XP, I ran Firefox/Thunderbird etc, anything but windoze apps, as much as I could. Now, with cloud based services (google drive etc) I feel fairly immune to whatever Windows throws at me.
One things for sure, touch screens are going to mandatory with next generation operating systems (W8 already is).
Let me make an (ex)profession prediction: Windows will slowly disappear from our awareness over the next 10 years.