There are a BUNCH of things that can cause IO problems. A ticket with MSFT on this is a non-starter. The problem is your system - period. Hire a good performance consultant and let them efficiently find/fix issues (there are ALWAYS a bunch of low-hanging-fruit issues whenever I do a first review at a new client) and mentor you along the way. Just a few hours or days will likely give you a system that is WAY different from what you are experiencing now!