OllyDbg on win7 64 bit
===

I've been following along lena151's tutorials on reverse engineering and all is going well except for unpacking. I'm running olly on a 64 bit windows 7 machine and it works fine except when the EP is always "JMP 71B00000" after following the jump an address is moved into EAX and then another one into ECX. A call is made to ECX and I get an exception that I can't pass to the program. This only happens when I step the code from the EP though. Could anyone explain to me what this is? Thanks in advance.