I don't exactly know what I was doing, but I stumbled upon a link to the SL(4?) dev runtime
http://go.microsoft.com/fwlink/?LinkID=188039 I installed this and my developer V4 runtime is back again. What gets me is that I meticulously keep my installers in folders and I have no history of this file or a similar one. I assumed the dev runtime was a part of the SDK, but it doesn't seem to be. It's been over a year since I setup this dev machine, perhaps my memory is erasing about how I got SL4 working. What a mess. Greg
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