While trying to install NPM v11.5.2 on Windows 2012 R2,
I got the error below (see picture below),
when i checked the orion service manager, i found just 4 service there (if i remember : Job engine, Collector Mangment agent, collector data processor, collector polling controller), also the solarwinds web directory was empty after finish !!
the Framework 3.5 sp1 & framework 4.0 & update 4.0.3 are installed.