I am hopefully wrong, but this error may go very deep in the system. My
computer needed a complete reinstall before selfcert worked again.

You might start with opening Internet Explorer, menu Tools Options (? I
have a localized version here), and somewhere there find the certificates
list and see what's there, maybe remove some old ones.

HTH. Best wishes Harald

"CraigBX" skrev i melding
...
When I run selfcert.exe I get 'Could not create a certificate'. Any
ideas?