When I try to install a certificate using the slmgr.vbs -ilc C;\xxxx command I get the following error: I have run SLIC Toolkit and I have a valid Slic 2.1 in my BIOS. I also have the Cert file in the root of my C Drive. I tried copying the slmgr file from the the winsxs folder to system32 folder but I still get the same error. The vb dll's are all registered. Any ideas?