A buffer over-run means that your computer sent more data to a buffer location than the buffer could hold, or faster than the buffer could empty.
Explorer.exe is your running Windows session.
In older versions of Windows, you set the number ofbuffers in config.sys
How many open applications do you have when the error occurs?
Remember, every icon in the system tray (right side of the taskbar) represents a running program.
Bring up the task manager (Alt-Ctrl-Delete) and see what allis running.
If there are applications that you do not recognize, I suggest that you run a spy-ware checker.
Either AdAware www.lavasoft.de
or Spybot Search and Destroy www.download.com
Chas