I believe you have accidentally pulled out the property manager tab, No problem we can fix this.
1) Are you able to see the property manager on the screen away from the feature manager tree ?
If not Select a sketch / feature, The property manager shows up some where on the screen, Then Just Hold the Property manager with LMB and drag towards the Feature manager, You would be given a choice of location to dock the property manager. Choose the appropriate place of your convinience and you are good to go.
Hope this helps,
View >Workspace and click on default.
Hope this helps..
AD's solutionshould solve ur problem...but if u want some complicated procedure to solve the problem
HKEY_CURRENT_USER ->SOFTWARE->SOLIDWORKS->SOLIDWORKS 2011->USER INTERFACE->COMMAND MANAGER
SELECT "COMMANDMANAGER and on right check th" Dock STATE" VALUE.........in ur case itll be 4.change it to '1'if u want it on topof the screen '2 ' for right
'3' for left.....
Thanks for all your help guys. I'm sure I'll have many more questions. Rob