You have chosen to start a remote support session using TeamViewer. You will be asked the following:
RUN or SAVE TeamViewerQS.exe

Please click on RUN - this will take approx. 5 seconds
The next message box will ask you to RUN TeamViewer - please click on RUN
 
The TeamViewer remote support message box will appear on-screen. You will need to pass the ID to your support representitive to allow them access to your P.C.
 
This whole process is entirely safe and will not harm your P.C. in any way.