Q: iTunes wont install?

Hi, I had iTunes and uninstalled it to redownload it as it was not working but now it wont let me download it again. i have done this multiple times. It keeps saying error itunes did not install correctly reinstall, something about itunes6464.msi and now finally it is saying apple application support was not found??

I am so stuck and i just want to update my phone to put new songs on it from my computer itunes. Can anybody help??????

I've watched many youtube videos and read many articles on suggestions and nothing seems to be working

Thank you!

Molly x