UPDATE: I started the Hadoop command line (click the command line shortcut on the desktop), at the c:\hdp prompt enter:
runas /user:hadoop cmd
enter the password for the hadoop user.
hadoop fs -chmod -R 755 /mapred
This will allow you to run the first part of the smoke tests. I am still getting errors on the Hive Smoke Tests but I suspect it is related to the same permissions errors. This is not in the quick start guide for installing on a single node.
Hope this helps other Newbies like me..