Hello. 
I was clean install a "DCSWorldver1.2.4" and "FC3ver1.2.4". 
and No problem about Start a Launch.exe. But I can't Start any mission. 
When I start a Instant Action or mission,everytime DCS.exe is stop and Error. 
but no crash log in LogsFolder.(Windows Application log says Stop DCS.exe) 
If not install FC3,I can play Su-25T.but After install FC3,cant play everything. 
Activation is success. 
Please help me.   
PC:Windows7 Pro x64 
Xeon E3-1230v2 
Asus P8C-WS 
ECC memory 8GB 
ATI RADEON HD5870 (Catalyst 13.4)   
I was tried,OS clean install,DCS clean install.every Windows update complete.Stop Anti-Virus.   
please...:helpsmilie: