Moving this thread in BMC Developer Network, where techy conversations should happen
http://communities.bmc.com/communities/community/bmcdn (there are many sub-communities to fit your needs)
what authorizations do you have granted to your role for windows systems, and what permissions are granted on the server(s) to the role?
can you live browse your windows servers as the role that gets the error? have you pushed acls to the windows servers recently?