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Driver issue USB Mass Storage Device
Win 7 64 bit Usb mass storage device says no drivers are installed. But there are drivers installed and they are up to date. A reboot helps but only for short time then the yellow exclamanation mark is back see screen record UsbMassStorage - vidme
I have USBSTOR.SYS at C:\Windows\System32\drivers\USBSTOR.SYS 89.5kb dated 9 3 2016
I followed
How to Repair Corrupt USB Mass Storage or CD/DVD Drivers - TechSpot Forums
If one or more of these files are missing
" Navigate to C:\Windows\System32\DriverStore\FileRepository
Scroll down. Find the folder name that starts with usbstor.inf_
You may see more then one folder with name starting usbstor.inf_. IF YOU DO: you want the folder with the most recent date
Open the folder. There's a copy of the 3 files you need. Copy each one to its correct location as shown above
Jump to the instructions below to delete the INFCACHE.1 file"
Copied UsbStorSys and pasted it to C:\Windows\System32\drivers overwriting the one that was there. Not sure if it work as i got 'you need permission' but it went ahead eventually
But I still have the exclamation mark inDevice Manager/UsB Mass Storage Devixce and camera or other USB will not be detected until i reboot and soon after the error returns. I also get messasges that a unknown USB has malfunctioned or similar wording