Add the file as an exception in avg.
Than you will need to validate the game files in the cache in steam, it will replace the file avg nuked.
In steam right click on the IL2 game icon, select properties. Than click on the local files tab
and than click on verify integrity of game cache.
In the vid settings un check grass and lower the building and tree amounts to low.
Read the manual and read the faq link at top of forum
