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Go to "My Documents\SEGA\PHANTASYSTARONLINE2\" There should be a file called user.pso2. Use a text editor to open it and try editing the lines saying
Windows = {
Height = 720,
...

I've been getting the issue with "The instruction at <insert memory address> referenced memory at 0x00000078. The memory could not be read."

This is the error that I'm getting:...