Open an explorer window, it doesn´t really matter which one. You can do this by opening a folder on your hard drives for example. Select Tools and Map Network Drives from the Menu. If you want the ftp to be available everytime you log into windows select reconnect at logon, otherwise uncheck the box.
Click on “Sign up for online storage or connect to a network server”, this will lead to the Ad Network Place Wizard setup. Hit next and wait until you can select Choose another network connection from the list that is displayed.

Click Next after choosing the entry and enter the ftp in the form field that appears. For example ftp://www.example.com/. Uncheck Log on Anonymously in the next screen and provide the login details to your ftp. First the username, then a name for the connection and finally the password that appears in the Log on As window at the end.

Select Log on and the contents of the ftp will be shown under the drive letter that you specified at the beginning.

Disconnecting the ftp drive is a piece of cake, right-click the drive letter and select disconnect, that is all.