Hi,
I have the same issue with my Sony Z228 as I accidentally triggered the fix all in Vaio Care and I cannot disable it,
I reformatted the whole system the last time to clear the defrag startup
The regedit does not seem to tally with the 1 given
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
Name Type Data
(Default) REG_SZ (Value not Set)
Optimise Complete