If your Internet Explorer is really acting up on you, and it is not a virus, it could be a bad or corrupted add in.
You can reset Internet Explorer to the factory defaults by going to the “Tools” menu, “Internet Options” menu and then “Advanced”. From here you can click “Reset”.
After doing this, you will get the “Welcome to Internet Explorer” screen and it will ask you to pick some startup options, just like when you first used IE. When this is done, you should be good to go.
* Note: The first time you put in a password for a site, it will ask if you want IE to save it. The best security option is NOT to let IE save your passwords.