If the ignite doesn't open and you have Aeria's SF...then
go to computer/local disk/aeriagames/Soldier front
Click on the SF folder and find a file named DF launcher.exe
You could either make a shortcut or just do what i told you whenever your gonna play SF
by clicking DFLauncher.exe you won't be needing the aeria ignite cause it's a direct launcher...
If you still have IJJI's SF, uninstall it..
and download aeria's SF here : http://download.aeriagames.com/files/games/us/soldierfront/csd/soldierfront_us_downloader.exe
Ignite : http://www.aeriagames.com/playnow/ignite
(I recommend you uninstall everything then try downloading the ignite again + SF)
Ignite : located at program files(x86)/Aeria Games/ Ignite
SF : Local disk/AeriaGames/SF
if you have questions, PM me..
good luck soldier