I think that you may have misread the question Mr/Ms PC Expert. The OP's question about her PC's connectively. She needs a new wireless adapter on her because she is unhappy using USB.
If USB is a problem then look carefully around the edge of the PC for a PC Card (PCMCIA) Slot. (I know that you say that you don't have one but they often have blanking plugs in them.)
The wireless button on your keyboard is to turn an internal wireless card on and off. To check if you have one installed, use Windows Device Manager to find out if the internal adapter is there in your PC. If it is you need to switch it on and then configure it (just like your current USB adapter) using Windows.
If the internal adapter is not present then get hold of Aldi to find out what to buy because Medion is one of the Own Brands.
t
April 2008