Error message while opening Maple

A member of my guild has recently run into a few problems with opening his Maple Story. When he loads up Maple and it gets through Gameguard then loads up to get to the Nexon logo then he gets this error -2005530516(Unknown Error 0x8876086C)

Any ideas? He has tried reinstalling it a few times and it did nothing. All he knows is that after he installed Diablo II on his computer again it started happening.