Avast unusable after upgrade from Vista to Windows 7

Avast is not working and is unusable after upgrade from Vista to Windows 7. I can’t find anywhere to get in touch with Avast directly. Any (sensible) sugestions?

Perform a clean installation of the latest avast version.

i suggest running avast removal tool and do a new install

you should find all instructions here
https://docs.google.com/document/d/1TCCX0R7AAF2WOxAMQ_kcun2nNnCPFAk2P4RBzFXSgds/edit?pref=2&pli=1

any questions, just ask