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For me, the following steps helped to eliminate the Commercial Use Suspected issue on Windows 7 x64 Enterprise:1. uninstall Teamviewer 52. delete the teamviewer folder in the %appdata% directory3. opening regedit and deleting everything that contains the word ‘teamviewer’ hitting F3 to search for the next string4. opening device manager to change the last character of the NIC’s MAC5. reboot and verifying that the mac indeed has been changed using the getmac command6. reinstall teamviewer 5Now I no longer receive the warning.

via How To Solve TeamViewer “Commercial Use Suspected!” Problem | Computer Tips And Tricks, Gadgets, How-To, Life – 2.0 Style.