Issues with usb wireless adapter

Hi
Please excuse my ignorance.
I have an imac (about 2 years old) with a built in airport card. I am trying to use a usb wireless adapter. It has a realtek rtl8187. we have a wifi network here that works with my pc using this adapter but i cant get it to work on the mac. You have to sling the adapter on the window sill but it picks it up fine.
I have installed the supplied software (obviously the mac one!) and it installs the software and driver. After i have restarted, and plug the thing in, it tells me to turn on my wlan card on the supplied software?? It shows up in the listing on network settings as ethernet adapter ((null)). I cannot find any setting to turn on my wireless card, i thought that was airport?
The airport picks up the network but the signal is too weak to connect, hence the adapter with a bit more guts....
I have this beautiful mac, colecting dust and am having to use a pc!
If i connect the usb adapter without installing the software, it constantly has a box popping up in network settings saying that an external device has changed settings! it doesnt stop doing it, until you delete the location...
Can anyone help? I may be being thick and dont have a wlan card or something or airport will not allow me to use this thing. I only just started getting into macs when i moved to spain, where it has sat colecting dust for 3 months.
I would appreciate any advice.
Thanks
Richard

TNHusker, welcome to the forum.
Cisco makes a router that is good for two-story homes.  I have used it for several years.  My router / hotspot is on the second floor and my Blu-ray player and laptop are on the first floor.  Both work extremely well with the router.  They also make a USB, AM10, that works very nicely with a desktop without a wireless card.
I have had a few problems with both, but have always been helped successfully by Cisco Customer Service.  They are very good.
Please click the "Thumbs Up+ button" if I have helped you and click "Accept as Solution" if your problem is solved.
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