I have a Dell XPS 400 desktop running Windows XP. Recently, my wireless keyboard became almost unresponsive. It will type, but the delay per keystroke is about a second. I changed batteries, checked the range with my wireless receiver, and nothing improved. So I assumed it was a bad keyboard and bought a wired USB keyboard. It's still doing the same thing. I checked the keyboard settings through control panel, and everything is set to its fastest setting. I reinstalled the driver, and the device status says it is working properly. What's even stranger, before Windows boots up the keyboard appears to work fine. I went into one of my setup menus before Windows booted and the keyboard was immediately responsive. I'm thinking it's a Windows thing, but I'm at a loss as to what it might be. Any suggestions?