Running Windows XP, SP3, fully updated as of a week ago. Occasionally, when trying to open files from Windows Explorer, the Explorer window will hang and become unresponsive. I have to use Task Manager to kill it, then my task bar seems to rebuild, and the machine seems to run okay (except I still can't open any files from Explorer). This happens almost every time.
If I open the associated program, the file opens as expected - for example, if I want to open a Word document, I can open Word, and then locate the document and open it. If, however, I locate the document and attempt to launch it by either double-clicking or using the right-click menu, Windows Explorer will hang almost every time.
What causes this, and what can I do to fix it?