Try doing a System Restore to before the problem started.
http://www.computerhope.com/issues/ch000589.htm
good luck
before that, try resetting internet explorer!
To use the Reset Internet Explorer:
1. Exit all programs, including Internet Explorer (if it is running) O
2. Open the Internet Options dialog box (either from within internet explore or through control panel.
3. Click the Advanced tab.
4. Under Reset Internet Explorer settings, click Reset.
5. When Internet Explorer finishes resetting the settings, click Close in the Reset Internet Explorer Settings dialog box.
6. Start Internet Explorer again.
Resetting Internet explorer should not affect bookmarks/favorites but I'd back them up in case and when you start up internet explorer again, you'll probably have to redo all the customizations you want in it.
If this goes well, you're not going to need to do system restore.