im using the same AV (bitdefender) on same win7_64x, and same 0xc0000005 error with Ragnarok.exe.
uninstall bitdefender fixed the issue, bcuz i cannot find a (if any) whitelist/exclusive function in it. its Bitdefender Antivirus Free Edition (http://www.bitdefend...tions/free.html) of this year (2015)
also, the Setup.exe, when i run it, all the resolutions are in 16 bit color (like 1440x900x16) is it just me? ?
and in graphic setting there are direct3D HL/T&L HAL, and my video card name in it, which should i use?
and in option the words are so small and wired, are they in english or something? what does "-Ai", "hoai", "merai" "noshift" "noctrl" "snap" "itemsnap camera.... what are there!!!???