Today I've been updating PSO2 all day. Unfortunately for me... I updated to Windows 8.1 just yesterday. Performance on many games has improved but with one sad fault... Gameguard is NOT allowing me to play PSO2. I get a "Critical Process Died" BSOD everytime I try to run the game after Gameguard updates. The game worked just fine on Windows 8.
Short Version: If you enjoy playing PSO2 DO NOT UPDATE TO WINDOWS 8.1
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