Windows 7: usb wireless adaptor to connect external HD to laptop

I was wondering if there was a device I could plug into the male usb lead on my hard drive and connect it to my computer over wifi or through another usb dongle on my laptop, this would allow me to watch movies without having to go to where my HD is stored and moving them to my laptop manually. I have a lot of files on my external hard drive, it is not portable and it needs to be plugged into a wall socket so I cant just carry it around with my laptop. My hard drive is a western digital 1TB external hard drive and I am using windows 7.

I don't know if that is going to work the way you describe it.

They make adapters like this:
TRENDnet - TU2-ET100 - Hi-Speed USB 2.0 to Fast Ethernet Adapter at TigerDirect.com
but a device connected to the router must be able to identify itself on the network with an IP address and MAC identifier.

Most likely you will need something like this:
D-Link 2-Bay Network Storage Enclosure

or this:
LaCie - LaCie Wireless Space