Posted 22 March 2009 - 09:16 PM
Sorry, I misread when you said you tried to open it with Internet Explorer. I mistakenly thought you meant Windows Explorer; thus my advice about opening strange files.
Did it ever sucessfully download the Windows updates? I don't think this file has anything to do with the updates, but if a file that size was coming in at the time you were trying to get updates, that could be what was preventing it.
All I know to do is to rename it for a few days or weeks and see if anything doesn't work right. If all is well, delete it. Or upload it to a web based data backup service so you'll have it if you need it. You could try to compress it, but if it was me, I'd rather not tinker with it.
Other than movies, I know of no files that size, and that would be even big for a movie.
The advice I offer is that of an advanced user, not an expert on computers or even XP.