Darryl,
I'm just about to give up on you.
Please read the link above carefully and in its totality, then come back and give us the pertinent details.
We're not mind readers nor clairvoyants. We don't have a clue as to what your machine is, the exact version of Photoshop and of the OS you are running, installed RAM, memory allowance to Photoshop, available free disk space, exact nature of your files, their size, the routine maintenance you run on your machine, what troubleshooting steps you have taken so far, etc. That's what the link tells you.
And you're not "exporting" anything, you're saving a file as a damned JPEG through Save For Web. What kind of key word is "export"?
Geeze, no wonder you're having trouble.
Once again: Click here <
http://www.adobeforums.com/cgi-bin/webx?50@@.2cd06cd9> for advice on how to ask your question correctly for quicker answers. Thanks!