I am trying to install windows-8-RT kb2771744 hotfix. I am getting a negative exit code: -2125124329
I converted that into hex: 7FDBFFE9
I looked around, I am not sure what to make of it.
It means "this update is not applicable to your system", possibly because you are trying to install an update for Windows 8 RT (ARM) on an Intel system.
See https://support.microsoft.com/en-us/kb/938205 for all Windows Update error codes.
0x80240017 WU_E_NOT_APPLICABLE Operation was not performed because there are no applicable updates.
By the way, to make sense of a Windows error code that displays as a negative number you have to interpret is as an unsigned 32-bit number. You can do this easily in the Windows calculator: