Smilie face

Hello, After I ran CCleaner for the first time, I can't help but notice that when I got to my email site , or any other site that I require a Log in name and pw, I now have to re enter the information. What setting in CCleaner do I need to uncheck to stop this when I run the program, and is there something wrong with being able to have your computer remember site Log in information so that you won't have to re enter the information every time you go to that particular page?