Computer malfunction

Hello Wendy.
We sincerely apologize for the inconvenience caused. To help you with this further, please attach us here with a screenshot of the error that you receive when you tried installing the program. This would allow us to assist you better.
Looking forward for your reply. Thank you.

I am trying to install AVG Performance pro that I just paid two years subscription to but get these messages.
authuitu-x64, DseShExt-x64, SDShelEx-x64, TUAnalyzeInfo64 and  TUTunigIndex64.
These are not registered or not found or something so the product will not install.
I am getting this Performance Pro because I am having problems with my PC laptop. It keeps coming up with errors that says it has to restart. I am running Windows 8.1, Firefox browser with MalwareBytes and AVG Free, though I have just paid $101 for two years subscription, as I said earlier.
Can any one help me please?

Hello Wendy.
We sincerely apologize for the inconvenience caused. To help you with this further, please attach us here with a screenshot of the error that you receive when you tried installing the program. This would allow us to assist you better.
Looking forward for your reply. Thank you.