You mention in the thread that you have Steam.
In the same line, very intrusive antivirus programs (such as Norton) are known to cause more issues than fix them - especially with anticheat systems. What antivirus are you using? Have you ran a antivirus scan with a quality scanner recently? (Malware Bytes, Herd Protect, etc.) Viruses trying to inject themselves into GG will kill it.
#GAMEGUARD ERROR E0190304 WINDOWS#
Is Windows up to date? Have you deleted and reinstalled all Tweaker pieces yet? (That being said, if you're on any form of 10, you will not be able to play the game.) Is it in a virtual machine, or straight up on a hard drive? If it is being ran on a virtual machine, please list both OS's (VM and root computer OS). What is the OS you're on, exactly? I can't figure out if you're still on 8/8.1 or if you're on the 10 tech preview. Have you tried reinstalling the game? (You could probably back up the gigantic data folder, uninstall, reinstall-pause-restore-backup, continue installation.) I miss this game and I wanna play with my friends again. Granted its not a OS issue cause it was working on Win 8 but then it kept showing the error. While others had theirs fixed, I still couldn't get mines to stop showing the error. I looked through every forum and sites on people having this error and while my issue was similar, the result isn't the same. My friends cant help me out cause they don't understand whats going on. I disabled my firewall, reinstalled my PC, reinstalled the game, deleted the gameguard folder, did the "fix gameguard issues" troubleshoot on the tweaker, removed any "gamebooster" programs, removed any antivirus programs i had, and i STILL get this error after all of that. I can log in just fine and get into the lobby for a few seconds. I'm now trying to get back on the game and I'm not using Win 10 tech. From proxies to patches here and there, my games started getting these NP1013 errors and I stopped playing the game all together. No issues occurred til after the DDOS attacks happened.
#GAMEGUARD ERROR E0190304 WINDOWS 8#
I've been playing PSO2 since 2014 and had Windows 8 when I started out.