Originally Posted by kovidgoyal
@xbingo: In my experience, BEX64 crashes are usually caused by aggressive anti-virus scanners. Try turning off your anti-virus temporarily and see if it works.
@piper28: A portable calibre release is meant to run on as many computers as possible. Lots of computer still run 32 bit windows, so a 64bit portable release will not be portable.
Thanks for repley!
However the problem is actually cause by my dictionary software!Orz