Hello all , my number keys on the right side of my keyboard do not work . I have windows vista & desktop .I tried another keyboard with usb plug in and same result . When pressing the "num lock" once there is a low tone ,then pressing again to illuminate as if on and a higher tone rings . This has never happened before and I only use a few websites like ebay,you tube , & amazon, plus the programs are all safe by norton antivirus . Sounds like a bug/virus or perhaps a setting that was mistakenly changed. I have tried a couple of free microsoft downloads that were recommended and also tried a couple of recommended setting changes but haven't been able to solve . Thanks for your help . Jonny Bultaco .