Holiday Greetings!
Been having a rough go after my primary HD started flaking out on me.  I ended up installing a new primary HD (SSD) and re-installing Windows 7 along with all application programs (was a long night last night).  My Music is stored on a 2nd HD, and backed up onto two other devices as well, so it was not directly affected by any of t his.  However, after re-installing  iTunes, I can't get iTunes to recognize the previous iTunes library, despite that fact that I point it to the library (Preferences, Advanced) .   Very disappointed that the iTunes install does not give any options to search for existing iTunes libraries.  All it get iniriLLY is the music that I have purchased directly on iTunes (which is not much). 
My music was previously stored on the M: drive under the iTunes folder.  I have the typical confusing array of iTunes generated files and folders, such that the actual music appears to be stored in "M:\iTunes\Media\Music" folder.
I have read the iTunes help, but it only tells me how to share across other computers on my network.  
What am I missing here?
Any help will be greatly appreciated.