[Bug 40432] the program Battle.net helper.exe has encountered a serious problem and needs to close.

https://bugs.winehq.org/show_bug.cgi?id=40432

--- Comment #3 from Jim  ---
(In reply to Alistair Leslie-Hughes from comment #2)
> try
> winetricks corefonts

Worked like a charm. I installed it to the .wine folder and it fixed the
problem with that install. I then copied them over to the PlayOnLinux
wineprefix and it fixed that one. Strangly the fonts were all there, so I
overwrote them. Then rebooted the prefix.