I have been trying to install a package which references MSADO21.TLB - which is the Microsoft ActiveX Data Objects Library.

However I am consistently getting this error:

There was an error when trying to register C:\WINNT\SYSTEM32\MSADO21.TLB
I have also tried MSADO20.TLB (V 2.0) with the same result.

This was working fine the other day, but now I am consistently getting this error...