I'm trying to install KB2919355 update, but i keep getting this 800F0922 error.

I read that expanding my system reserved partition would help, but it doesn't show on disk manager. It's shown in partition magic tool, but it won't let me resize it, it doesn't give me the option for that.

PD: I've made some unallocated space for expanding that partition, but the program doesn´t give me the option for resizing.

PD2: Is this fórum section the right one for this problem?