It is good that microsoft is on hand with excellent advice
Just wipe your machine and re-install.
Luckily most of your average Windows users are completely backed up, and those who are not can easily get the files back with a linux live CD.
Luckily all their personalised settings are simply in a few plain text (hidden) files in their home directory so after the reinstall all personalised settings can be restored.
And most Windows users pick Windows due to the speed of the install and their love of making their own bootable disks. Not just because it comes as standard.
Personally, I feel I am missing out on the fun here. None of my Kubuntu installs have ever kerploded on me like this.