The executable was decoupled from its accompanying media directory layout.
The "" has a very specific and vital job: it acts as a setup safeguard. Before Visual Studio 2012 installs any of its core components, this tool first scans your system for conflicting or partially installed versions of Microsoft software. Its main role is to clean up any "package source" leftovers that could cause conflicts, ensuring a clean environment for the new installation. vsprecleanvsexe visual studio 2012 exclusive
Error Log Snippet Example: [091C:0620]: Acquiring package: vs_preclean_vs, payload: vs_preclean_vs, copy from: E:\packages\VS_Clean\VS_PreClean_vs.exe [091C:0620]: Error 0x80070002: Failed to run pre-clean script. The executable was decoupled from its accompanying media