Try the following: In Explorer, Go to Tools > Folder Options > Filetypes Tab. Find an entry called 'Folder' (It should be at the top of the list somewhere). Right click on it and make sure that the 'Open' is present and that it is set to default. If it exists but is not default, Simply highlight it and click on the "Set as default" Button. If it does not exist, Click 'New' and in the 'Action' Field, Type 'Open'. In the 'Application to be used' Field type the following :%SystemRoot%Explorer.exe /idlist,%I,%L and click ok. Make is default.