I have been working for years - inside and outside the office - on my Toshiba Satellite, XP SP2, Explorer 7.
I bought it in 2003 ... day after day I'm aware it was a big deal.
A bad day in late december 2008 my Toshiba didn't work at the usual speed, there was something real wrong ...
I had seen some new notebook somewhere in a Carrefour or Esselunga or Conad (these are the Wal-Mart - likes in northern Italy), so I decided to buy a new Lenovo.
Huge RAM & Hard Disk.
But, as I turned it on ...OMG.
The keyboard ... some of my usual keys were missing, my fingers felt displaced.
No owner's manual, neither in the packaging or on line.
The only one I downloaded was a 200 pages "assistance manual" ... completely unuseful.
The system ... Vista.
I downgraded to XP.
Then I tried to load my Excel, Word, and so on but ... impossible, they were too old, cannot run.
I'd have to buy a whole set of new softwares ...
I needed to complete some work within the year, so ... I went and bought (50 EUR) a brand new Hard Disk, that was the fault.
I did it by myself and in a few minutes everything was OK again.
Er ... few minutes

if you don't count reloading XP, downloading SP2, refusing SP3, validating Windows, and all those boring things you bump in when you reinstall everything from the very beginning ...
However, my old Toshiba works better than ever, my old Word and Excel run at their best.
The other notebook - reinitialized to Vista: it's resident and you just have to press a button. That's good - has been immediately recycled as a Christmas gift to my 17 y.o. son, who's very proud of his new tool: very fast, very good in playing games, OK in Facebook and MSN Messenger and all other stuffs.
(Thank you Toshiba).