If the driver above did not solve your problem, then you will have to use the manual method I will be explaining below to install the drivers.
This method works for all Windows PC ( XP, Vista, 7, 8, 8.1 an 10 )
Download Spreadtrum manual install USB drivers from here
Extract the file downloaded from above.
- Goto My Compter (This PC) > Right Click and select Properties > click Device Manager.
- Press windows button + R on keyboard and type devmgmt.msc then hit ENTER button
After launching device manager, Click on Action from the menu above and select Add legacy device
Tick Install the hardware that I manually select from a list (Advance) and clcik Next
Then click Browse
Navigate to the folder containing the driver and select SciU2s.INF
Hardware to install SCI Android USB2Serial click Next
open adb_usb with notepad
type in 0x1782 (if it is not there) then save.
Now thats how to install your spreadtrum drivers manually.