Some of the following messages you may have seen on Windows system:
- Access denied.
- The file is in use by another program or user.
- The source or destination file may be in use.
- Cannot delete file: It is being used by another person or program.
That means, the resource you are accessing is locked up by another process (program).
Freeware Unlocker [via gHacks] can help you solve the problem by releasing the file or folder from certain process’s control. The program integrates itself into Windows context menu, and available on Windows 2000 / XP / 2003 / Vista.
In another post from gHacks, a similar freeware File And Folder Unlocker is introduced. With the (nearly) same functionalities, File And Folder Unlocker lets users explorer in depth to find out where the problem occurs. But for a novice, I prefer Unlocker. It does the job, and looks easier to use.