Reclaim/Move a Lost/Off-Screen Window in Windows 7

METHOD 1
1. Alt-tab to lost window
2. Right-click on icon for lost window in the task-bar - You may have to first hover over the icon (if it's pinned)
3. Select 'Move' from the drop-down menu
4. Hit any arrow key
5. Move mouse to re-position

METHOD 2
1. Right-click on task-bar
2. Select 'Cascade windows'

METHOD 3
1. Alt-tab to lost window
2. Press Alt+space
3. Press m
4. Press any arrow key
5. Move mouse to re-position

[Courtesy of How-to Geek]