I only run Avira Antivirus, but i did it the last 10 years without problems. I run 1.11.03 all the time without problems, for me it seems that the weekly windows patches makes often problems. I reinstall all this fck visuall C+++ drivers but the problem goes on. Thats me most wonder is,that sometimes it save and send in MP games and sometimes this error occurs. The same in Singleplayer, but there is no action it seems then you can say,hey i do this or this and the error comes. And for MP games this is total frustrating like Nez say, i have a game played for two days that i must restart 6 times, first i played 3 hours,all attacks and so on played will send him turn on server game and boom this error comes and back to desktop,grrr, restart game, open single player, try to save,error,grrr,restart go in singleplayer try to save and it go, think ok go back to my MP game play 10-15min and try to save only and it goes.Then i end the game,perhaps if i try to load directly new after save i become an error,but this was so from beginning from playing this game for years,also i restart game new load my MP game and play 10-15min try to save and error,grrr, reload game and MP game and the same **** every time,sometimes it goes sometimes error, but if you play the same **** 4 times behind with 4 different endings in the rolls……..my nerv, i have this error at normal version and with steam version,i have it two times, and i become this error with 1.12.04, i try it out for a few days with the normal version. With 1.12.05 didnt test it but i think its the same.