Microsoft has required the OEMs to use bios to only allow Microsoft to be loaded otherwise no windows. This part of there new "anti virus" program. Most OEMs are locked in so if you want to run Linux etc ask before you buy. It is getting hard to find PC or Laptop that does not have Microsoft locked in.
Sorry but you are wrong.... if it was true Microsoft would be fined by the US Government and the EU....
All the best Brett