Steam Error 81; Application load error Q;0000065432

[saine 19]

Depending on which way i start ArmA I get these errors. After some research i'm pretty sure they are steam related but I couldn't find a solution. I found something with Comodo Antivir, but i've never used this.

Hope one of you guys can finally help me

[saine 19]

I found this list and it turned out that that my AMD Crimson Tool caused the problem.
https://support.steampowered.com/kb_article.php?ref=9828-SFLZ-9289&l=english

 

edit: This also prevent Squad from starting.