Unfortunately, there is no definite answer that I know of that can easily fix this. I used to have this problem, but it ended up going away on it's own. Try launching the REACTOR when there are no other background applications running, (EX: Steam, xFire, etc) and make sure that your firewall and anti-virus security allows the launcher and AVA to go through it. Sometimes the firewall and/or anti-virus can interfere with the REACTOR launching and updating because it thinks its a virus. Other then that, I suggest just waiting until IJJI moves over to Aeria Games, because hopefully they will either get rid of their pointless game launcher or create a better one. Best of luck to you, if I figure anything out, or find a way around it, i'll let you know.