How to distribute the CAcert root certificate through Active Directory onto all computers

[Active Directory is the database of a Microsoft domain (or a domain tree). It contains information about all domain computers, printers, users, user groups, computer groups, user/group rights etc. Moreover, the domain objects can be divided into Organization Units (OU). You can assign Group Policy Objects (GPO) to OU, the whole domain, and its controllers, with different settings, which is propagated through the network to target objects (e.g. computers). One of many settings may be root certificates of various CA.]

Taken from:

An example

(A Domain Controller on a Windows server 2003)