Question details:

I lost my application data and local settings in document settings. I lost my old email folders in outlook express. Is there a way to retrieve my folders? How do I get Application data and local settings back?

Answer:

We suggest to try to do a system restore. You can find detailed information on how to do that here

Be sure that you have installed on your computer an up to date antivirus. You can use AVG Free Antivirus.