Hi RDX913,
The only stupid question is the one left unasked :)
Your COMPONENTS hive is specific to your computer as it depends on what updates are installed on your computer. So replacing it with one from another computer will make Windows Update very confused.
SFC, simplistically, works by comparing your system files to what they should be (this data is stored in the COMPONENTS hive) so it can't be used to repair the file it uses to repair files - if that makes any sense.
Tom