$10 paypal if you can answer this Paypal will be paid once your theory to the problem is concluded to be true. You guys will have to trust me that I will pay you. Problem: My company developed an USB device with it's correspond INF driver. We have tested the device on numerous computers, laptops, and desktop and everything works acording to specification. Last week we demo to a perspective buyer of the device. When the buyer tests the device (on two separate computers), the device fails installation on both systems. Buyer is a large company with standard and up-to-date equipment. Systems are both Windows XP Pro with SP1. Both systems were logged in as Administrator or a user in the Administrator group. typical installation process as follows: 1) install software. 2) plug in USB device 3) Windows finds the driver and everything *should work*. What happens at the buyer's location is 1) install software 2) plug in USB device 3) !! Windows can not find the correct driver for the device. 4) When we force a driver match (hard code), Windows responds by saying that the driver chosen does not contain infomation for the hardware device (along those lines). The device and drivers have worked many many times before. The driver and device have been show to be reliable and worthy of sale. Questions: Is it possible that there is something on the buyer's computer that is preventing Windows from installing of the INF &/or hardware? Question: what on the buyer's computer can cause conflicts with the USB device? Cliff Notes: Can't install a USB device even through the proper driver is specified.