Hi all.
After days of frustration i have managed to fix my dcs.
I had the issue where DCS would crash at startup but i could play multiplayer in windowed mode.
************Solution*************
Set your desktop resolution to 1024*768
Boot up DCS.
You should then get an error msg say missing "pthreadgc2.dll"
Go and get the missing file from
http://files.filefront.com/pthreadGC2dll/;7674775;/fileinfo.html
Copy the file in to your system32 folder and your wow64 folder.
Boot up dcs
You should now be able to get into the options screen.
Adjust your resolution to suit.
exit dcs
Reset your desktop and you should be good to play single and multiplayer in full screen..
I hope this helps some of you out