If the installer refuses to install and complains about an RPC configuration error, check to ensure that the following registry entries are present and that they refer to the dll "rpcrt4.dll":
HKLM "SOFTWARE\Microsoft\RPC\ClientProtocols" "ncacn_np"
HKLM "SOFTWARE\Microsoft\RPC\ClientProtocols" "ncacn_ip_tcp"
HKLM "SOFTWARE\Microsoft\RPC\ClientProtocols" "ncadg_ip_udp"
HKLM "SOFTWARE\Microsoft\RPC\ClientProtocols" "ncacn_http"