Certain applications run in he background and we cannot see them.
To close such application
Right Click on the bottom taskbar and click Start Task manager.
In Applications Tab look for Adobe Bridge If found Right Click on it and select End Task
If Not then go to the second ab "Processes" and then look for Adobe Bride.exe when you get it, Right click and select End Process.
In spotlight search for Activity monitor
launch Activity Monitor and select Adobe Bridge and Click on Quit Process.
Hope It Helps