trial Fix Teamviewer Commercial use detected and Expired
Teamviewer Commercial Use Suspected Warning Message

You might experience annoying warning as shown above when you are try to connect with your friends through teamviewer. Below specified instructions for advanced users only and we are not responsible for any data loss occurs when you follow the steps and always recommend you to take a whole registry backup before to proceed the steps.
Step 1 : Close and exit your teamviewer application if it is running
Step 2 : Click Windows Start > Run and search with %appdata% variable and find theteamviewer folder and delete it.

Step 3 : Beware, This step is very important and have to follow instructions with caution. Click Windows Start > Run and enter regedit and click OK. Find the registry entry located at HKEY_LOCAL_MACHINE > SOFTWARE > teamviewer and remove the teamviewerregistry folder.

Step 4 : Change the MAC address (ID) of your Ethernet card and restart your computer. If you doesnt know about how to change your MAC ID, Follow this link to learn about it.
Once your restart the computer, run teamviewer and connect with anyone else remotely. There is no more pop-up of Commercial Use Suspected warning and its gone now. Enjoy your teamviewer session.