Hi
Just upgraded to 2.7.0 64 bit. Did a *full* install. Still have 2.6 and 2.5 installed.
When I first start 2.7.0 from Start Menu, I get the attached dialog indicating avformat-57.dll is somehow ... wrong.
I'll uninstall and try a reinstall, maybe remove old version, etc.
Thought you might want to know in case it's a wider problem.
HTH.
Uninstalled and reinstalled as 'standard' (not full). Works fine.