Running the installer as an adminstrator puts DeltaEC into its own folder inside the ProgramFiles(x86) folder, complete with the Users Guide. File names ending in .out should automatically become associated with DeltaEC. Shortcuts should appear on your desktop and in the Start menu. Example files will be installed in a folder of your choice.
If you don't run the installer as an administrator (e.g., by right clicking on the installer and selecting "Run as administrator"), you may find that you don't have the authority to put anything in c:\ProgramFiles(x86).
A good location for the "DeltaEC Examples" folder can be the installation folder itself, from which you can copy the example files to another, temporary working folder when using them. Other good locations for the "DeltaEC Examples" folder include c:\Users\myusername\Documents (which is equivalent to MyDocuments in Windows Explorer) and c:\Users\Public\PublicDocuments (which is equivalent to Documents in Windows Explorer).