Here's 3 sure ways of deleting any locked file in Windows....
1.Taskmanager
1)bring up taskmanager...2)go to processes...3)right click on explorer,and in the context menu,select END PROCESS...4)click on file,on top,and select New Task Run...5)in the new pop up window select browse,and browse to the file,right click on it and see if you can delete it...6)
2.Unlocker
If that doesnt work,download a small very usefull app,called 'Unlocker'...after installation,right click on that stubborn file,and select unlocker in the context menu...a window will pop up...at the bottom is a drop down window....select 'delete'...then select 'unlock all' on the right hand side...if that doesnt work then go thru steps 1 - 6 on top but this time use unlocker when you right click on the file,and do everything i mentioned on top concerning the 'unlocker' app....
Hope this works for you..if it doesnt,i'll post another