how do i "check" my songs in Itunes I'm on PC with Microsoft Windows Vista.  iTunes was stuck for forced it to close.  When I reopened iTunes all 5000 of my songs were unchecked.  

How do I put the check mark back on all of them?
Select all the Songs:
Then  crtl click to get the contextual menu.
Select Check Selection

This is assuming that the PC version of iTunes has the same menu system.