PC Remote Repair Module that is free to use on my pc repair website

I just created a new website. I was wondering if anyone had a module which allowed me to give my customers easy access to receive remote assistance from me. I want something where the user would go to my home page, click in the upper right corner, and within a few clicks allowed me to remote control their machine in order for me to provide them tech support. Maybe something java related. If you have experience with this type of work please bid, and message me with examples of your work.