|Thers's probably nothing wrong with the USB hub !|
"It was working good until last night when I plugged an old usb scanner into it. I powered up the scanner and booted up. The found new hardware wizzard came up, and looked like it was looking for a new device, but didn't find it. "
Follow the scanner manufacturer's installation directions !!
E.g. Usually you DO NOT plug in the USB cable to a scanner or printer or multi-function device until at least some of it's software has been installed first ! Sometimes you install part of the software, then you are prompted to plug in the USB connection to the scanner, if it's plugged into a USB port it works properly with the scanner is detected, then more software is installed. Sometimes you install all of the software, reboot, THEN you're prompted to plug in the USB cable to the device, or were told to plug in the scanner after you rebooted, before you rebooted - if it's plugged into a USB port it works properly with the scanner is detected fine.
Usually it is a BAD idea to install drivers for a more sophiscated device while booting into Windows, before the software for it has been installed in Windows itself for it, when Windows detects the device while booting, you allow it to search for drivers, it doesn't find any, and it wants you to provide a drivers location. That often does NOT install the software for the device properly, because more sophisticated devices "drivers" are actually drivers and associated software that works with the drivers, both of which must be installed properly. CANCEL that, continue on to the desktop, and install the software for the device using the proper installation program you load from a CD that came with it, or install the proper download you got from the web.
If you DID install the drivers that way, go to Control Panel - Add/Remove Programs and un-install the software that you wrongly installed, and install it the RIGHT way.
USB hubs, powered or not, often DO NOT work correctly with a more sophicated devices plugged into into a port on them !
The scanner must be plugged into a USB port it can actually work properly with when you have initially installed it's software and you plug it in and it's supposed to be detected the first time, otherwise the device is often not detected correctly or not detected at all, and/or any software that is supposed to be installed after that point will probably not install, or will not install properly.
In that case you probably need to un-install the software for the device, unplug it's USB connection, reboot, install the software again, and THEN plug the device into a USB port it DOES work properly with.
Some of these reference the same info - some have unique info.
USB devices may not work correctly when they're connected to certain USB ports e.g. ports in a hub or on the front of a desktop case. If you have a desktop computer, you may have an IRQ sharing problem you need to fix, or your power supply may be starting to fail.
See response 3 in this:
Also - if you are using a USB extension cable, some of them have inadequate wiring and will not work properly with some USB devices.
USB hubs don't work for all USB devices.
How to add more directly connected USB ports.
How to t-shoot and possibly fix problems accessing data on an external drive or flash drive or memory card, etc., and what usually causes the problem.
External drive requirements.
See Response 4:
The flash drive (or external drive, or memory card reader) must be plugged into a port it will actually work in.
How to tell if the flash drive (or external drive, or memory card reader) is properly recognized as a hardware device, even if you can't access it's data.
(Similar applies to multiple port USB hubs that connect to only one USB port - "powered" or not.)
The most frequent reason people can no longer access the data on a USB flash drive, USB External drive, or a memory card on a computer
See Response 2:
More info about USB connected external drives:
See Response 9: