sp_OACreate vbscript.regexp Class not registered
Ten months later, the issue occurred again on the same system.


Specific error: 0x8007045A (A dynamic link library (DLL) initialization routine failed)


I cannot find the cause of this issue. However, I found enough related scenarios  (ten months ago) that suggested that rebooting the server would solve the problem.

I rebooted the server cluster (both nodes, following controlled failovers), and the issue was resolved (can create a 'vbscript.regexp' object using sp_OACreate).