The simple answer is that MS doesn't want this.
Considering all the problems of Windows why not require the box makers to use a DOS operating system that uses limited graphics.People could still have Windows but would have to start in this DOS then if Windows was giving them problems it would be easy to go to another operating system or use DOS.
oh yes and xp "is more stable" ... right
Microsoft will take there OEM lisences away if they put in any other OS besides windows. EDIT: Welcome to Microsuck:)
Close. The answer is actually that consumers don't want this.