Recovery partition lost

my laptop, Satellite P855-S5102, came with win8 pre-installed. i upgraded to win 8.1 and now i get prompt that SYSMENU.DLL is not working. i tried system recovery. now i get this message: i need to repair my laptop because WINLOAD.EFI is missing. i tried system recovery from usb flash drive. now i get this message: recovery partition lost.
i check the HDD in explorer. now it has two additional partition. one named local disk and another named recovery.
will removing all partition help? i'm planning to reformat the whole HDD. is it advisable?
also, how can i enter the bios easily? i'm having difficulty accessing the bios to setr it up back so HDD will be first to start.
Thank you to anybody who could help me
i'm new to this forum. my name is bunglerph

Satellite P855-S5102
i'm planning to reformat the whole HDD. is it advisable?
Sure.
If you failed to create recovery media, you can obtain it from Toshiba. Scroll down to Get Recovery Media here .
For instructions, see the section Restoring from recovery media, which begins on p. 60 of the User's Guide.
   Satellite/Satellite Pro P800 Series User’s Guide
After all that, you'll need to upgrade to Windows 8.1 again.
-Jerry

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