Can I use an AP as a better client/receiver for my PC?

In my home I have ADSL broadband over the phone line, coming into a BT
Home Hub (DSL modem/firewall/wireless router). The wireless coverage
is not good, especially to an office where my wife's PC is located.
Moving the router is not an option. But...

My wife's PC has a little USB dongle as a WiFi client. I also have a
spare NetGear wireless access point. Would it be a good idea to
replace my wife's PC's dongle with the NetGear AP? Is it possible to
configure an AP to act as a client? How?

Thanks

Bob