Welcome to site Psychdoc. Hopefully your a psychologist as some of the people here need some help
I hope you do not mind that I have moved your post into the appropriate categeroy. We like to keep it organized here so people can find the answers they need quickly.
There are two things that need to be done for someone to successfully connect to you via remote assistance. The first is that it must be enabled. You can enable it by following these steps (eventually I will write a tutorial on this):
Click on start then click on control panel. Double click on the System Icon. Then click on the remote tab.
You must put a check mark in the box labeled Allow remote assistance invitations to be sent frmo this computer. Then click on advanced and put a checkmark in the Allow this computer to be controlled remotely. Now you can send out invites and people can connect to you.
There is one problem with this though. Remote Assistance uses a tcp port 3389 whic all firewalls will block by default on your computer. Therefore if you are running a firewall or have a hardware router you must enable tcp port 3389 to reach you.
Hope this helps