I seem to be having a number of problems with PI-windows-x86_64-01.08.04.1190-20151112-c., newly loaded on my Win7 64b machine. The last of which was that it just spontaneously rebooted my machine while trying to use it with lots of icons on the workspace!! Prior to that, I had two LRGB Combination operations to create RGB's that, when I examined the components after the images came out quite strange, had identical components (R and G in one case, G and B in the other case). It didn't occur a third time, but I've never made that kind of cockpit error before, much less twice in one session. It seems to me that 1190 has some problems with Win64 also. I don't see other people reporting problems with it here but I went back to v1123, which is still posted on the distribution site and, so far, haven't had further problems.
-Jeff
P.S. I was working on a large project that had been created in my previous version 1.08.03.1123 Ripley (x64), if that has any relevance.