Two trainers failed as I know of today from my son: Code Name Panzer Cold War, Company of Heroes Tales of Valor. OS: Windows 7 Ultimate 32 bit IE 11 installed .Net Framework version 4 Microsft Windows Automatic Update is on, so many updates installed since I installed Windows 7 into my PC. The latest update was recently. Antivirus: Microsoft Security Essentials (free)
I tried to uninstall IE 11 from Program and Features, but no luck, so I installed it back.
Let me know if you need more information. I hope I could get the fix soon as my son needs it.