for any one still intrested in this, i have discovered a fix for this error..
I copied the openssl.exe and 3 .dll files (jwinauth.dll, libeay32.dll and ssleay32.dll) to the directory I was running the repoint.cmd command from, and it then passes all the openssl commands..
This in my case was "D:\Program Files\VMware\Infrastructure\VirtualCenter Server\ssoregtool\sso_svccfg"
Hope this helps