What you need to do:
*Connect your Phone to your PC via USP cable.
*Extract "Speadtrum CPU USB Driver.rar" to a folder on your Desktop.
*Go to your "Contral Panel"
*Double Click "Add Hardware" (sometimes under "Printer and Other Hardware")..
*"Add Hardware Wizard" window will appear. Select "Yes, i have already connected my Hardware" Click "Next"
*Choose your Phone Hardware on populated selections. Click "Next", Click "Finish".
*Click "No, not this time"
*Click "Install from a list or Specific location (Advanced)"
*Uncheck "Search Removable Media".. Click "Browse" button, and select the folder where you extract the Speadtrum CPU USB Driver files..
*After selecting the correct folder, click "OK", click "Next"..
Windows will install the drivers for you.