I had the problem with Game Guard detecting a hacking tool. I deleted the Game Guard folder, but after logging in, after a minute, got a error 620, a problem with Game Guard itself, this was after I launched the game from the launcher. I checked the directory again and noticed that the Game Guard folder had appeared again, the launcher had re-downloaded Game Guard, but I did not delete the folder again. After launching the game again, I was not kicked from the game. I am assuming that Game Guard takes some time to "reinitialize" or something once re-downloaded.
Try deleting the GG folder if the **** tool error comes up. Restart the game, and you should get an error 620. After the game kicks you again, do not re-delete the GG folder, just start up the game normally. That is the action that I took and I was no longer kicked from the game. It has been an hour since then, and no problem.
It worked for me, have no idea if it will work for others, as it could of just been a fluke or something. But after I got the 620 error, I re-launched the game without deleting the GG folder again, and was able to play normally without a dialog coming up and being kicked off.