Upgrading from XP to Win7? Not too sure about that myself.
Even if the system in question would support it.
I have two HP notebooks that won't upgrade to 7
so I run XP on them even though I have unused Vista Licenses for both of them.
My Dell notebook OTOH is running Vista and I'm not too fond of it.
My HP dc7800 system is factory Vista and I'd like to get rid of that too, but reverting it to XP? No.
Upgrading from Vista? Oh Yeah!
My HP dc7600 is running XP and frankly I'd be inclined to leave it alone.
THE reason for any "upgrading" would be for newer application software compatibility...
Support is the issue.
When Microsoft or whomever brings out new browsers the web site designers gradually drop support for the older browsers and if your OS won't support the newer browser version you are SOL with a computer that essentially no longer has web access.
That Is why I recently retired the last few Win2k systems that were in my area of responsibility, as you say... it worked.... until it didn't anymore.
Somewhere around here I still have one of those systems.
Yes, it still works... "sorta"... But "Sorta" doesn't get the job done.
The handwriting is already on the wall for XP... or atleast the beta version of XP's death will soon be released in the form of IE9
which allegedly isn't supported by IE8
and sometime in the next year to 18months when YouTube drops support for IE8 and you can no longer view videos....
unless you can make computer evolution stop the only thing to do is roll with it....