As a single user I originally installed the Operating System with a single user account. I have now discovered this is not recommended because of the vulnerabilities of Trojans gaining access to the root directory. I have therefore created another administration account and changed the original one to a limited user account. Is this correct? I notice Outlook does not recognise the Back-up programme in the new account. Any idea why? There are numerous sets of unwanted user folders in the My Computer tree. Namely Administrators Folders, All Users Folders, Default Users Folders, My Original Account Folders, My New Account Folders. There are also two additional folders namely My Documents (Original User Account)and My Documents (New User Account. Are all these folder necessary and if not is it possible to delete some of them and how?