I believe that wiping the disk is the best way to not only crapware, but also ensure no viruses or malware is present. Yes, it is expensive to get a retail copy of Windows to re-install, Brien is talking about travelling with the laptop. The last thing you want to have is a laptop that doesn't work properly. If you're only occasionally taking your laptop wherever you go, but not travelling (like work or commuting to work) then not really necessary. For most of our travelers, laptops are provided by the company, it is wiped, Windows re-installed, updated then when everything is checked, the whole disk is encrypted.