I use windows XP on a PC. I have a Net Gear Dual Band Router N600 WNDR3400. It has been working fine for over a year. On the top it had a large BLUE BUTTON (WPS) to connect other wireless devices. The trouble started yesterday when the blue button started flashing. I have checked with NETGEAR's support group and they think someone may be trying to access my network and I need to DISABLE THE ROUTER"S PIN. I have done that and the light is still flashing. Does anyone have any other suggestions? Thanks Wally.