TS
When you say that kb2919355 update will not install at all, do you get an error message. Re another part of the fourm. We will be forced to update Windows 8.1 to 8.1 Update (8.2 a better name) what ever that entails, by May 13 2014. Without kb2919355 you may be scuppered re the update.
Possibly start a new thread because many may be affected.
And give some indication of any error Msg you get. With all the usual Op system details Anti vir in use etc.
The Thresd needs a stickey to inform posters, to "post" their specs on initial post of probs if possible.
CAT III