Isn't it only viruses that overwrite your master boot record without your permission?
Permission implies asking. Windoze has never been known to ask anyone's permission, or opinion, about anything important.
Windoze just unconditionally takes over the MBR without asking if it can be allowed do that on YOUR computer. Linux LETS you correct that situation. Linux is not only better, it is more polite
. A characteristic sadly lacking in most places and situations in this ole world