I have a windows xp desktop with latest patches and updates. I've had
this problem for about a year now since I got the Verizon Fios router
(not blaming the router). I moved computers around the house. My
desktop, which used to be connected via wire, moved to a room without
a wire connection so I've tried at least 3 different wireless cards to
see if I could improve the connection. If I took wireless laptops in
the room they would all get very good signals and connect fine. I
finally discovered that if I turned off any type of Wireless Security
I could connect with this new USB N adapter. Then I discovered a
leech on my network and played around with settings that would let me
connect and not the leeches. I started using MAC address filtering.
Well, I have decided to again tackle WHY I cannot use security. I
want to be able to use WPA security and connect with a very good
signal.

Again, only the desktop has the problem. I don't know if there the
older motherboard hardware on the machine which is over 4 years old is
the problem or something else.

Can someone help me figure this out? I have done many many searches
and have not found the answer.

Thank you in advance.

Suzan