When I install a SQL instance on all nodes at one the ImagePath Reg key
at localmachine/...../services/mssql$instance looks like
c:\progra~1\....\sqlservr.exe -sinstanse. But when I install an instance
on one node after this add the instance to other nodes the reg key on
the new nodes looks like: \\nodename\c$\progra~1\....\sqlservr.exe
-sinstance. Which is fine as long as the sql service account may access
c$. Which it can't if its running as a normal user (which of course is
not recommended). This \\nodename\c$ does occurs on some other reg keys
like performance and the sqlagent service

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Hans