I was adding something to my hosts file yesterday and in order to do so I removed the read-only from the entire system32 folder and all contents. After restarting the computer it wouldn't boot up so I figured this was the problem. I booting with the Win7 disc, and put read-only on the entire system32 folder. Now I've got windows defender saying it needs to start from the action center, but every time I click start it just opens the system32 folder. I've also tried starting AVG, but the action center keeps saying it's still off (though it is started). Is this a result of the entire system32 folder being read only?...of so, any easy way to fix it?