[MalphasWats]

I did this once. I installed Ubuntu on a new laptop, resizing the disk partition as I went. When I switched back to Windows, I realised I had left it hibernated and the partition resize upset it very much.

A day or so later, I tried to install some sound drivers in Ubuntu and somehow managed to uninstall xwindows entirely (I learnt to read and think before typing stuff in off a web site :)

A day later I rebuilt from the windows install disk and left things alone. I keep Linux on my servers, it's much happier there!