I have been having the same problem since upgrading to IE 10 in Windows 7.
Even with the box unchecked to delete cookies I still lose any and all saved logon information.
I am a long user of CCleaner and love the product but was forced to uninstall it today.
Must be some glitch in IE 10.
Here's hoping you can get it fixed so I can get back to using one of my favorite programs.
Barry