static void getInstalledPatchesList(const CString& productCode,                                CAtlList< CString >* patchesList)
{
   UINT retval;
   UINT patchIndex = 0;
   TCHAR patchGuidBuffer[MAX_PRODUCT_CODE_LEN] = _T("");
   TCHAR transformsBuff[100] = _T("");
   DWORD transformsBuffSize = sizeof(transformsBuff)/sizeof(transformsBuff[0]);
   
   do {
      memset(patchGuidBuffer, 0, sizeof(patchGuidBuffer));
      memset(transformsBuff, 0, sizeof(transformsBuff));
      transformsBuffSize = sizeof(transformsBuff)/sizeof(transformsBuff[0]);
      
      retval = MsiEnumPatches(productCode, patchIndex, patchGuidBuffer,
                      transformsBuff, &transformsBuffSize);
      if (ERROR_SUCCESS == retval) {
         patchesList->AddTail(CString(patchGuidBuffer));
         ++patchIndex;
      }
   } while (ERROR_SUCCESS == retval);
} //end of getInstalledPatchesList