Regenv32 is one of the programs/files modified when the real-mode DOS patch is applied to ME ...did he apply that patch?
If so it may have corrupted the program to the point that it is now causing errors....
Or if the DOS game was installed and it added lines to the autoexec or config.sys files the may be a conflict....
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Celts are the men that heaven made mad, For all their battles are merry and their songs are all sad.