About windows update using wuapi

[hanq_38910130]

Hi all, I have created a program which can scan windows update, download updates, install updates. But its scan results defer from that of MBSA, it always gets more results. After I checked it, I found that it involves "SupersededUpdateIDs". MBSA often removes update items that are superseded by others. However, this is not always true. After I improved the program according it, I indeed reduced the difference between MBSA and my program, but still some difference. Can anyone tell me how MBSA dealed with the scan results? I mean, what MBSA has done with the scan results according to "SupersededUpdateIDs" or anything else? Also, When I use "download" and "install" function in my program, sometimes there are errors, like "0x80240024"(when download), "4"(when install) HRESULT value returned. I want to known if it concerns with my os setting or something else. So can anyone tell something about this? all above. thanks a lot :)