AutoComplete Stopped Working
AutoComplete (when Internet Explorer 4/5 guesses
what you are about to type in the address bar based on where you
have been before) can sometimes stop working, or become very slow.
This happens when your History folder gets full up with lots of
previous addresses and can usually be solved easily by clearing your
History.
Internet Explorer 5 tends to speed this feature up
far better than Internet Explorer 4 did, but you will still need to
clean out your history folder every few weeks or so to get the best
results.
If you need any more help, see Microsoft
Knowledge Base Article Q175663 (The AutoComplete Feature May Not
Complete Long Web Addresses).