format PE console ; 
entry start ; 

include 'include\win32a.inc'

section '.idata' import data readable ; 

library kernel,'kernel32.dll',\
msvcrt,'msvcrt.dll'

import kernel,\
ExitProcess,'ExitProcess'

import msvcrt,\
printf,'printf',\
getchar,'_fgetchar'

section '.data' data readable writeable ; 

array dw 2, 8, 2, -6, 14, 5, 6, 17, 4, 14, -4

len equ $-array

MESSAGE db "Negative %d",0
MESSAGE2 db "Positive %d", 0

section '.code' code readable executable ; 

proc_pos_and_neg:
  mov   esi, array ; esi points to the array.  In MASM, use OFFSET word_array
  xor   edx, edx           ; pos_count = 0
  xor   eax, eax           ; neg_count = 0
  mov   ebp, -1            ; constant to test with

  lea   edi, [esi + len]  ; points one past the end of the array
  xor   ebx, ebx          ; clear upper portion, because setcc r32 isn't available, only setcc r8  

countloop:
  test   bp, word [esi]   ; test reg, mem can micro-fuse, but test mem, imm can't
  setg   bl               ; 0 or 1, depending on  array[i] > 0
  lea    edx, [edx + ebx]  ; add without affecting flags
  setl   bl
  add    eax, ebx          ; can clobber flags now

  add    esi, 2            ; extra loop overhead compared to the scan-backwards decrementing an index reg I used last time
  cmp    esi, edi
  jb  countloop            ; loop while our pointer is below the pointer to one-past-the-end

      ; neg_count in eax,  pos_count in edx

ccall [printf], MESSAGE, eax
ccall [printf], MESSAGE, edx
ccall [getchar]
stdcall [ExitProcess],0    

mov edi,edx
ccall [printf], MESSAGE, eax
ccall [printf], MESSAGE2, edi    

entry proc_pos_and_neg    

You didn't say exactly what problem you have so I'll wing it from what I see above ...

You print the same MESSAGE twice. I presume the second printf is meant to be MESSAGE2.

Also, ccall will corrupt the values in registers eax, ecx, and edx. So the value in edx is now lost after the first ccall. You can save it another register like esi or edi

Code:

mov edi,edx
ccall [printf], MESSAGE, eax
ccall [printf], MESSAGE2, edi    

I can't find where you define the start label. Perhaps try:

Code:

entry proc_pos_and_neg    

What error message do you get when you compile?