so I just got a D-Link Xtreme N Desktop Adapter (DWA552) and installed it as per instructions but my computer doesn't even know it's there (I have Windows 7). When I put in the installation CD, I get the message saying that I should put in the adapter but it's already in. I thought at first it was a corrupt adapter, so I exchanged it but the new one does the same thing. I know the slot works because I had a N150 adapter in a few days ago. Don't have another slot on my computer to try. Tried everything.....need help! Anyone else had this problem?