[Pandora]

Explicitly stopping the program may not resolve the lock.

The application that runs the xml file may create file locks on the xml temp file. For example, if you are running SP2 and use "Help and Support" windows creates temp files called imt*.xml which can remain locked. They can also be safely deleted.

Alternately, if you are running a specific application or java applet that relies on xml for data transformation/transfer, the application may use temp files. (IE uses MSXML) Often, simply clearing your temporary internet files will release these locks. Alternately, if you are running a local IIS for web apps, refreshing IIS may work.