I proceeded as follows:
- I opened up the certificate as received from Verisign in Windows.
- Under details I selected "Copy to File..."
- I exported in the format "Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B)" and selected "Include all certificates in the certification path if possible"
- Continued to export to the .P7B file (which was now in DER Format).
- Opened the new P7B file by double clicking on it.
- Exported Each Certificate in the .P7b file to its own .CER file (In Base 64)
- Concatenated the .CER files extracted from the .P&B file in this order: Certificate, Intermediate, Root
- Copied the concatenated result into STRUST under "Import Certificate Response".