1. Start Microsoft Management Console (MMC) Tool

Click Start -> Run -> Enter MMC and click OK

2. Click File -> Add/Remove Snap-In...

3. Add Certificate

Select Certificates in left panel and click Add to move to right panel , Then Click OK

4. Select Computer Account option and click Next

5. Click Finish

6. Click OK

7. Start to import Trusted Root Certificate

A. Expand Certificates Node
B. Right click Trusted Root Certificates -> All Tasks -> Import.

8. Click Next

9. Select the downloaded Certificate file

Click 'Browse' to select correct Certificate file and click Next

10. Click Next

11. Click Finish

12. Done