Hello dugiedugie,
We see you're having some issues getting iTunes to launch on your Windows PC, and we'd be happy to help work on that with you.
Are you receiving any error messages when trying to launch iTunes? Also, if possible, are you able to launch iTunes in a second Admin user account on the PC? That step would help to see if it may be system-wide or isolated to the user account.
If you're utilizing any antivirus software or other security software, try temporarily uninstalling it.
Sometimes a quick restart of the PC may help as well, if you haven't tried that yet.
You may also try holding down Control+Shift as you launch iTunes to see if that helps.
Take care.