In the "Tools" menu select "Internet Options...". A dialog box should pop up.
In the first tab ("General"), there should be some buttons labelled "Delete Cookies" and "Delete Files".
"Delete Files" clears out your cache of temporary files.
"Delete Cookies" deletes any settings you've made on various web pages (Google preferences and such).
Your browser will also forget that you're logged into ADT and similar sites. Nothing to worry about. Just login again.


