I just thought I would stick my nose in this thread since it has been revived.

Perhaps I need to clarify my 3rd post and add to my post count

Under certain circumstances such as multiboot machines, machines with dynamic disks and machines that contracted a stealth virus, Fdisk /mbr can royally screw up your PC.

Extra Reading if you are interested
http://support.microsoft.com/kb/69013/EN-US
http://support.microsoft.com/kb/166454
http://forums.windrivers.com/showthread.php?t=29431


Given that many users read down to the first fix and try it without reading any caveats, the intention of the post was to prevent people grabbing their Dos boot disk and rewriting the MBR making recovery pretty much impossible.