Q: iTunes won't open?

Hi guys!

After recently updating iTunes to the newest version, my iTunes just won't open anymore.

I tried reinstalling and installing it back over 5 times, used repair, even tried with Quicktime (update, repair) and still nothing.

I figured if I install an older version will do the trick - the installer runs until the end, gives me an error and that's it.

Anyone able to help me please, as I used iTunes for my iPods, phones, tablet and everything.

Thank you kindly!