Computer Re-starting
 

When downloading a large file, i leave it to download overnight. In the morning I find my pc has shut down and re-started it's self and the down load has been interupted. Any one know why?????

I can think of 2 reasons (but I'm not a windows user.) Update your Java at: http://www.java.com/en/download/windows_automatic.jsp for version 1.4x OR http://java.sun.com/j2se/1.5.0/download.jsp (take the JRE) for version 1.5
The other reason I can think of is a hardware issue.

Have you checked your power saving settings? they might be set to shut the system down after a hour of idle or so forth.