The first and fastest thing I would do is to make sure you have all your Windows updates.... then do a clean up. Open IE and go to Tools ,Internet Options and clear out the Temporary Internet files, cookies and anything else you want to delete....Remember when you may have to sign into some places again but at least you know that all the junk is out of there.
I have never used the Preserve Favorites website data....I will have to do that some time....LOL
See if that helps.