a. M2Server.exe cannot run
Solution: Stop the SSDP Discovery Service in Administrative Tools -> Services.
b. After creating the character and entering the game, the screen turns black.
Solution: I think this is caused by M2Server.exe failing to properly read the game information, which relates to the first issue mentioned above. Please help resolve it. It seems that everyone is currently encountering these problems. If the solutions above don't work, then try using the method designed for Win98.
Compilation of issues after entering the game.