How to restore my sony vaio windows 8.1 laptop to factory settings HELP !

[rajan4949]

HELP ! Sony vaio 14a26cg ! i bought the laptop which is loaded with windows 8 on 2013. After that my windows ge updated to 8.1 since then i was using 8.1.
Now the system telling me to activate winndows !! some of them suggested me to restore the laptop to factory settings. when i try to reset the pc it shows me this error ''Can't restore Required drive partition is missing" ! is there any possible solution for this? some one help me please !!

 

[USAFRet]

Call Sony and/or MS. A regular, authorized, update from Win 8 to Win 8.1 from the MS Store should not trigger a reactivation event.

 

[camen_men]

HELP ! Sony vaio 14a26cg ! i bought the laptop which is loaded with windows 8 on 2013. After that my windows ge updated to 8.1 since then i was using 8.1.
Now the system telling me to activate winndows !! some of them suggested me to restore the laptop to factory settings. when i try to reset the pc it shows me this error ''Can't restore Required drive partition is missing" ! is there any possible solution for this? some one help me please !!

Here the youtube video https/youtu.be/tJ5qs-FTOrM