Will writing a new bootsector delete data?

So im at the point which my computer starts at a black screen, and Im trying to repair the 2nd parition. It says

''Write a new bootsector to the Parition C''

Will this delete the pictures, and other stuff etc?

I tried chkdsk/ R

but it wont recognize that command!

Will writing a new bootsector delete data?norton 360

technically writing a new bootloader won't delete information off of a partition except for the old bootloader, which is probably corrupt anyway if you're at that screen while repairing a partition. in reality, your pcitures and other stuff may be gone anyway if your FAT (file allocation table) is gone anyway. however, writing a new bootloader (damaging the pictures/other stuff or not damaging it) is worth it anyway because without it, your stuff is absolutely gone vs. having a chance of still existing. If you're scared, download a rescue cd off of the internet and see what it can do for you.