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All USB not working? If not remove USB device re-boot and then re insert USB device. Still does not work check Device Manager look for any errors under the USB list. That said, how old is your Samsung and what are you using in your USB port?
did you try with other USB devices, for example USB mouse or Keyboar. if those things acan work then there must be some issue with your flash drive. if all the devices are not working then you should see in device manager your USB driver are upto date or not.
The problem you have stated can be due to several causes. Please eject your USB drive from your computer and insert it again. If windows does not detect it, then restart your computer and try again. If the problem is still there, please check the Device Manager if the USB port is properly working and if it is possible to use the troubleshoot. The best way to check whether your USB device is properly working or not, insert it to another computer other than your's. If the problem persists, check your USB device's warranty period and simply go for the replacement and contact your retailer or service provider.
You can go to Device Manger by following the steps below:
My Computer Icon>Right Click on the Icon>Properties>Device Manager
You mentioned that you uninstalled the unknown device from the Device manager. If you uninstall it then connected your usb flash drive you will see an error again on your device manager. This means that the driver for your usb port is not properly installed.
To install it, visit dell website, look for the model of your machine and locate the driver, download it then install from your machine.
Check to see if the USB device you are attempting to connect works in a different system (preferably one that has never seen that device before, perhaps check with a friend)
If it works without issue on the other machine then check the acer website for driver updates.
If it does not work, you either need to install drivers for that device or you have a defective device.