Hey guys I just recently bought a Dir-655 Router and my wired in pc and my mac (wireless) can run the internet. But I also bought a DWA-552 for my other pc that runs wireless and I cannot connect to the router. I tried manually setting up my ip in windows xp but that still doesn't work. Last night it would connect to the router though but then it would not let me access the internet. Now this morning it tells me windows cannot find a certificate to log into the network. What is the problem? I've tried uninstalling and reinstalling drivers (manually and automatically) too. The adapter just gets stuck validating because it can't find the certificate. Is this maybe a windows error because I mainly bought this adapter because my older one wasn't working with my older router.