had to reload vista on my sisters laptop - she didn't have a restore disk so I used a toshiba disk that I had and then just entered her activation code from the label on the bottom of the laptop - job done and all activated just fine.
Only thing I've noticed is that if you go into 'control panel' 'system' the manufacturer is listed as Toshiba rather than Dell and there is a toshiba logo, is it possible to change the manufacturer name and logo some how?