antivirus is not the problem, last time can start ftb unleashed with antivirus[DOUBLEPOST=1404391031][/DOUBLEPOST]i can start unleashed ,once i add the mod in my unleashed fail to start up
Yep, antivirus can still be the problem even if it worked last time.
Anti-virus software continually downloads new definitions of what it considers a virus. Even if it worked yesterday, overnight it could have downloaded new definitions which caused it to now consider FTB a virus.
It's not, which is why you need to exclude it. If you don't want to because you don't trust FTB or me, feel free. You'll never be able to play FTB again, but you can be safe in the knowledge that you have no viruses.