I'm running Ubuntu and am getting an error message with the game World of Warcraft, been playing it for a long time with this same computer. Now I am getting this error message when trying to install their most recent update:

This application has encountered a critical error:

FATAL ERROR!
Program: D:\games\WOW\BNUpdate.exe
Exception: 0xC0000005 (ACCESS_VIOLATION) at 0073:408C4DD5

The instruction at "0x408C4DD5" referenced memory at "0x00000000".
The memory could not be "read".

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x86 Registers
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EAX=00000000 EBX=409025BC ECX=FFFFFFFF EDX=00000000 ESI=00000001
EDI=00000000 EBP=40671B04 ESP=40671AF4 EIP=408C4DD5 FLG=00210246
CS =0073 DS =007B ES =007B SS =007B FS =003B GS =0033


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Stack Trace (Manual)
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Address Frame Logical addr Module

408C4DD5 40671B04 0000:00000000 <unknown>
0040E0BC 4067225C 0001:0000D0BC D:\games\WOW\BNUpdate.exe
400B5DC0 40672304 0000:00000000 <unknown>
400B5ED3 40672438 0000:00000000 <unknown>
4FA3D381 406724B8 0000:00000000 <unknown>

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Stack Trace (Using DBGHELP.DLL)
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408C4DD5 <unknown module> <unknown symbol>+0 (0x40242040,0x00000000,0x00000001,0x40242040)


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Loaded Modules
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0x00400000 - 0x00495000 BNUpdate.exe
0x03000000 - 0x03118000 dbghelp.dll
0x40040000 - 0x40136000 ntdll.dll
0x40683000 - 0x406C9000 msvcrt.dll
0x406E8000 - 0x40708000 gdi32.dll
0x4079E000 - 0x4088E000 user32.dll
0x408B2000 - 0x408B3000 shell32.dll
0x40959000 - 0x4097F000 ole32.dll
0x409C2000 - 0x409C3000 rpcrt4.dll
0x40A02000 - 0x40A03000 shlwapi.dll
0x40A33000 - 0x40A34000 comctl32.dll
0x40ACC000 - 0x40ACD000 oleaut32.dll
0x40B12000 - 0x40B13000 version.dll
0x40B1C000 - 0x40B1D000 lz32.dll
0x40B85000 - 0x40B86000 x11drv.dll
0x5F400000 - 0x5F4F2000 mfc42.dll
0x77034000 - 0x7708E000 kernel32.dll

I've been to the Warcraft tech site, it said to try deleting my interface folder and a couple other folders, have tried this with no luck. My RAM seems to be fine too. Any suggestions on what could be causing this/how to fix it would be appreciated