Samples are installed in two different paths
C:\Program Files\Microsoft SQL Server\100\Samples
C:\Program Files\Microsoft SQL Server\100\Tools\Samples
I've been frustrated trying to find the sample databases or AdventureWorks Analysis Services projects in C:\Program Files\Microsoft SQL Server\100\Samples when they are actually in C:\Program Files\Microsoft SQL Server\100\Tools\Samples. Searching in the first folder doesn't help b/c the sample DBs and AS projects or in a different branch of the folder tree.