Don't you love your life? For god's sake, please don't use VBScript.
If I may suggest, you should instead look at
PowerShell [
^]for the scripting which you are doing. It's more friendly and does a lot of things for you already.
Next, what have your tried so far? You just mentioned that functional requirements here. And in fact leave alone "How to do this?", I would first ask "Why should you implement this?". What is the added advantage of having a Script show something in a task bar.
If you still want to do it in VBScript, you might get some help from this similar discussion:
http://support2.microsoft.com/kb/176085/en-us?p=1[
^]
And as I tried to sold PowerShell to you, that makes this thing really simpler. Have a look here:
http://technet.microsoft.com/en-us/library/ff730952.aspx[
^]