Try ing to step through this progy but get to sysenter call and don't know how to pass it. Read what i can find on system calls & ollydbg but don't understand some of it, have tried a few of the tricks to get past it but to no avail. Could someone please have a look & push me in the right direction. I know it's something staring me straight in the face!!

http://rapidshare.com/files/158980219/showsim.ZIP

Did you try the suggestion offered in your other topic, http://www.woodmann.com/forum/showthread.php?t=12163 ?

Debug your program using windbg or SoftIce. As a ring 0 capable debugger, it will get into the sysenter call, and if you are patient, you may come back to your user code as soon as the user call is done. There is no magic formula, trace, debug and learn.