some how you have either removed the wireless software or you have not installed or you are trying to by pass it...

Go back to where you got the driver for the wireless networking adapter and install the software package to use. It may be that it is from the manufacturer and not part of the adapter itself. It could be just turned off so look in the start > programs and see if you can find the wireless program installed. If not then you need to install it. Once it is installled it will run automatically when you go wireless...

Since you mentioned that the connection is manual means that you have bypassed the software application. It could be that the wireless service has been turned off in the system services.....
start > control panel > admin tools > services and scroll down to the wireless connectivity and open it and see if it is set for auto. the ok out and retry to connect.