I'm afraid I'm one of those people whp never explores technicalities 'because they are there' I wait until I have to... then sometimes it's too late... my own fault.
The XP went, I thought it was a gonner for keeps. I had taken a load of files off onto discs, but that was as far as I went. No Backup, which wouldn't have been any good, because the poor old thing was stuck on the black screen with the options of how to start it, and all it did was try to start and go back to the black screen. Then it went completely and I thought it was gone forever.
That was when I got the Vista. All the discs I had made worked in Vista with the exception of the Word documents... No Word program on Vista, you have to buy it, and if they think I am going to do that when there are other, free or cheaper programs....well, not unless I have to.
Luckily I have a lovely chap who came and breathed life into the XP, but he warned me it's on it's way out, back up and don't over use. This is what I have been doing.
I also have one of those desk top hard drives, (this lot talked me into it) I've never regretted it.
I'm not adventurous with my computer work, glorified typewriter that does pictures and allows me on the Internet, and that's about it, so perhaps I haven't tested Vista like others.
My only complaint, the trouble with reprogramming the printer/scanner and no Word, apart from that...and having to learn not to Save to, but Burn, and Organise to Delete...
No Problem