I was having a similar issue, when I tried to 'Start without debugging' (going through the tutorial), it was giving an error that it could not find the http site. I had gone through the Reporting Services Configuration Manager, but I still was getting an 'not configured' on the Report Manager Virtual Directory (no explanation), finally figured out that the 'Report Manager Virtual Directory' was not configured (even though it told me it was).
I hope this helps.