Take a look at This Post. #1 and #2 apply to your situation. Follow those instructions and see if it helps. Basically, you’re going to want to give launch and access rights to the “Everyone” group and “Anonymous”.
For testing purposes, make sure that you give the rights for both Local and Remote access. After you get it working you can back it off until it breaks.
Also, make sure that there isn’t a firewall enabled, and if there is, that TCP port 135 is allowed.
Hope this helps, let me know how it goes.
Regards,