Personally, I assume the pre-requisites are NOT installed. Every XP workstation I've touched has required their installation. The C++ redistributables are 2005 & 2010. There are folders for both in the 2013 Prerequisites folder. Also, I have a checklist of things to ""assign"" to IT, when possible. After spending lots of time updating XP workstations and trying to stay productive in the meantime, I'm adding this to my IT checklist.