For individual form autocompletes, you will have to highlight (select it) in
the dropdown list and then press the "Delete" button.
Or...
http://support.microsoft.com/kb/217148/en-us#XSLTH3127121122120121120120
"How to use the AutoComplete feature in Internet Explorer 5 and 6".
1. On the Tools menu, click Internet Options.
2. Click the Content tab.
3. Click AutoComplete.
4. Click the appropriate AutoComplete check boxes, or click Clear Forms or
Clear Passwords to clear all saved items from the appropriate AutoComplete
history.
5. Click OK, and then click OK.
http://support.microsoft.com/kb/157729/en-us
"How to clear the History entries in Internet Explorer".
http://support.microsoft.com/kb/260897/en-us
"How to Delete the Contents of the Temporary Internet Files Folder".
Try also...
CCleaner, from
http://www.ccleaner.com/
Free History Eraser:
http://smartprotector.com/eraser/free-history-eraser.htm
The History folder can be deleted manually:
http://mvps.org/winhelp2002/delcache.htm
--
Vincenzo Di Russo
Microsoft® MVP - Most Valuable Professional
Windows - Internet Explorer since 2003
http://support.microsoft.com/newsgroups