IE problem

[caesar]

Hi. I've just re-installed Windows 2000 and then the IE 6 with SP1 and noticed that if I have the "Forms" enabled in "Tools / Internet Options / Content (tab) / Auto complete" my IE freezes for a while when I go for instance on google.com and write something in the "search" field and then either press TAB button to jump to "Search" button or press it via mouse. I tried without any hotfix and with all recomanded hotfixes from the windows update page and it's the same thing. An workaround this is to disable the "forms" from autocomplete BUT this still happens when either I press the "Clear Forms" or "Clear Passwords" buttons. It stops responding for a while then works again.. Any iddea what this may be?

PS: oh, yes, it's nopt an virus, ad-ware, mal-ware, whatever. I've double-checked this.