My 80211n wireless adapter does not pick up my clear wireless router. My OS is windows 7. My router has to be connected by Ethernet cable then it is exceedingly slow. Best location for router is in attic.
An Ethernet connection would be running at 100MB with no interference, it would be a lot faster and smoother than a wireless connection.
You need to add some details here, did this work before? Is the adapter working properly in the computer? Is it just not seeing your wireless network name? Is it seeing other networks? What did you try already?
If your ethernet connection is slow you may be using a very old or damaged cable, try a new one. Or you are using an old hub between the computer and the router.