attempting to change process name winXP

import sys, os
sys.path.append(sys.prefix)

os.environ['PATH'] += ';' + sys.prefix

from win32con import PAGE_READWRITE, MEM_COMMIT, MEM_RESERVE, MEM_RELEASE,\
    PROCESS_ALL_ACCESS, PROCESS_VM_OPERATION
from commctrl import LVM_GETITEMTEXT, LVM_GETITEMCOUNT, LVM_SETITEMTEXTA

import struct
import ctypes
import win32api
import win32gui

GetWindowThreadProcessId = ctypes.windll.user32.GetWindowThreadProcessId
VirtualAllocEx = ctypes.windll.kernel32.VirtualAllocEx
VirtualFreeEx = ctypes.windll.kernel32.VirtualFreeEx
OpenProcess = ctypes.windll.kernel32.OpenProcess
WriteProcessMemory = ctypes.windll.kernel32.WriteProcessMemory
ReadProcessMemory = ctypes.windll.kernel32.ReadProcessMemory
memcpy = ctypes.cdll.msvcrt.memcpy


def readListViewItems(hwnd, item=0, subitem=0):

    # Allocate virtual memory inside target process
    pid = ctypes.create_string_buffer(4)
    p_pid = ctypes.addressof(pid)
    GetWindowThreadProcessId(hwnd, p_pid) # process owning the given hwnd
    hProcHnd = OpenProcess(PROCESS_ALL_ACCESS, False, struct.unpack("i",pid)[0])
    pLVI = VirtualAllocEx(hProcHnd, 0, 4096, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE)
    pBuffer = VirtualAllocEx(hProcHnd, 0, 4096, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE)

    # Prepare an LVITEM record and write it to target process memory
    lvitem_str = struct.pack('iiiiiiiii', *[0,item,subitem,0,0,pBuffer,4096,0,0])
    lvitem_buffer = ctypes.create_string_buffer(lvitem_str)
    copied = ctypes.create_string_buffer(4)
    p_copied = ctypes.addressof(copied)
    WriteProcessMemory(hProcHnd, pLVI, ctypes.addressof(lvitem_buffer), ctypes.sizeof(lvitem_buffer), p_copied)

    # iterate items in the SysListView32 control
    num_items = win32gui.SendMessage(hwnd, LVM_GETITEMCOUNT)
    #item_texts = []
    item_text = ''
    #for item_index in range(num_items):
    #    win32gui.SendMessage(hwnd, LVM_GETITEMTEXT, item_index, pLVI)
    #    target_buff = ctypes.create_string_buffer(4096)
    #    ReadProcessMemory(hProcHnd, pBuffer, ctypes.addressof(target_buff), 4096, p_copied)
    #    item_texts.append(target_buff.value)
    win32gui.SendMessage(hwnd, LVM_GETITEMTEXT, item, pLVI)
    target_buff = ctypes.create_string_buffer(4096)
    ReadProcessMemory(hProcHnd, pBuffer, ctypes.addressof(target_buff), 4096, p_copied)
    item_text = target_buff.value

    VirtualFreeEx(hProcHnd, pBuffer, 0, MEM_RELEASE)
    VirtualFreeEx(hProcHnd, pLVI, 0, MEM_RELEASE)
    win32api.CloseHandle(hProcHnd)
    return item_text

def SetItemText(Handle, pStr, Index , SubIndex = 0):

    # Allocate virtual memory inside target process
    pid = ctypes.create_string_buffer(4)
    p_pid = ctypes.addressof(pid)
    GetWindowThreadProcessId(Handle, p_pid) # process owning the given hwnd
    hProcHnd = OpenProcess(PROCESS_ALL_ACCESS, False, struct.unpack("i",pid)[0])
    pLVI = VirtualAllocEx(hProcHnd, 0, 4096, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE)

    #c_string = pStr.encode('ascii') + '\x00'
    c_string = ctypes.c_wchar_p(pStr)
    strSize = ctypes.sizeof(c_string)+4

    #alloc some shared memory for our string
    SharedProcMemString = VirtualAllocEx(hProcHnd, 0, strSize, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE)

    # Prepare an LVITEM record and write it to target process memory
    lvitem_str = struct.pack('iiiiiiiii', *[0,Index,SubIndex,0,0,SharedProcMemString,strSize,0,0])
    lvitem_buffer = ctypes.create_string_buffer(lvitem_str)
    copied = ctypes.create_string_buffer(4)
    p_copied = ctypes.addressof(copied)
    print ctypes.sizeof(lvitem_buffer)
    print strSize
    print WriteProcessMemory(hProcHnd, SharedProcMemString, c_string, strSize , p_copied)
    print WriteProcessMemory(hProcHnd, pLVI, ctypes.addressof(lvitem_buffer), ctypes.sizeof(lvitem_buffer), p_copied)


    #set the text
    win32gui.SendMessage(Handle, LVM_SETITEMTEXTA, Index, pLVI)

    #'clean up
    #FreeMemSharedNT hProcess, SharedProcMem, LVISize
    #FreeMemSharedNT hProcess, SharedProcMemString, strSize
    VirtualFreeEx(hProcHnd, SharedProcMemString, 0, MEM_RELEASE)
    VirtualFreeEx(hProcHnd, pLVI, 0, MEM_RELEASE)
    win32api.CloseHandle(hProcHnd)



import win32gui


if __name__ == '__main__':
    print  "starting main"
    RetVal0 = win32gui.FindWindow('#32770', 'Windows Task Manager')
    RetVal1 = win32gui.FindWindowEx(RetVal0, 0, '#32770', None)
    RetVal = win32gui.FindWindowEx(RetVal1, 0, 'SysListView32', 'Processes')
    pSource = 'pythonw.exe'
    pDest = 'myGui.exe'

    if RetVal:
        ii=0
        i=0
        while ii < 26:
            RetStr = readListViewItems(RetVal, i, ii)
            #print readListViewItems1(RetVal, i)
            #print RetStr
            if RetStr == '': # Then ' we've come to the end of the columns
                if i == 0: #'was the first loop thru
                    i = 1  #'could be the correct column, but .exe not found so add +1
                    ii = -1 #'start the column count over
                else:
                    break

            elif ".exe" in RetStr.lower(): #'we found the Process column
                #tCount = win32gui.GetItemCount(RetVal)
                # iterate items in the SysListView32 control
                tCount = win32gui.SendMessage(RetVal, LVM_GETITEMCOUNT)
                for i in range(i, tCount - 1):
                    RetStr = readListViewItems(RetVal, i, ii)
                    if RetStr.lower()  == pSource.lower():
                        #If Delete Then
                        #    Call DeleteItem(RetVal, i) #'doesnt work as well
                        #Else
                        print 'calling SetItemText'
                        print RetStr
                        print pSource
                        SetItemText(RetVal, pDest, i, ii)
                        #End If
                        #ModifyExe = True

                        #'[EXIT DO] can be taken out if the app runs multiple instances
                        #'the reason why i put it here is because i am trying to limit
                        #' the amount of unneeded sendmessage calls to taskmanager
                        #Exit Do #'should only find 1 instance of itself.
                        #break
            ii = ii + 1