@Melonlity -- The chances of a hacker exploiting one of those remote access programs are rare, but there are some things you can do to make sure.
Keep in mind that those programs take seconds to download and install and a lot of IT support types are used to waiting for someone to go through that process. That being the case, there is nothing in the world wrong with simply uninstalling the remote access program after it is used.
Again, you will probably be safe with one of those sitting on your hard drive. If you are worried, however, it is simple to take care of the problem. Once the IT pro is done with the program, simply uninstall it.