Transposing a section only

Win 7 has been reinstalled maybe this has something to do with it. Thing is if I click on Notes and Rests I can press Shift and dragging the mouse across the notes does nothing until I remove Shift then the notes turn blue. This is only the notes not the typical box with notes in. You cannot change these notes e.g. transpose.
What do you mean Mode and ctrl or Region Mode? I can go to Region (no mode) put in section but this does`nt Hi light the notes. I`ve got a page of notes, where is Notation Player in relation to this, how could I have got there.
Sherry I`ll try and send the page to you. Don`t worry about wanting to transpose etc. just help me back to obtaining a blue Hi lighted section of notes by dragging that I have been used to.