Hi Phasid
If Geoff's answer gave you the solution you were looking for then you might like to give him a star.
However I read your posting as when excel launches, ie the application! As I'm low on things to do I thought I'd post this for the hell of it anyway!!
Create & save a file in this location
C:\Program Files\Microsoft Office\Office\XLStart
and add this code to the workbook module as described above.
Private Sub Workbook_Open()
MsgBox "Hello " & Environ$("username"

Application.Workbooks.Add
ThisWorkbook.Close savechanges:=False
End Sub
This is a totally pointless process unless you call another procedure from this code ie open another workbook etc.
God, I need another job!
;-) If a man says something and there are no women there to hear him, is he still wrong?
"...Three Lions On A Shirt..."