Finding a Workaround
Now we understand the problem -- so how do we fix it? To be able to do this, first of all you need access to the administrator account on your computer. This may not be possible in most cases, so you may need to forward this section to the appropriate personnel.
With this sorted out, go to Start and enter mmc in the search box, and then tap Enter. Agree to running the Microsoft Management Console, and when it opens go to File > Add/Remove Snap-in… and select Certificates. When prompted, select Computer account > Local computer and then OK; click OK again to complete the addition of the Certificates snap-in.
Next, in the left-hand pane, expand the Console Root > Trusted Root Certification Authorities > Certificates and find the Root CA certificate.
Once you have found this, right-click and select All Tasks > Export… and in the resulting Certificate Export Wizard click Next > select DER-coded-binary X.509 (CER) > Next and then Browse… to where you want to save this on your local computer. As you will be sending it as an email attachment shortly, make sure you choose somewhere memorable. Click Next > Finish to complete the export, and then browse to where it is stored, right-click and select Send to > Mail recipient.