Excel 2007 Charts Using Visual Studio 2005

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C#2.0

C#

Visual-Studio

MS-Excel

Hi everybody,
I am trying to export some data to an Excel 2007 workbook and then create some charts using some parts of this data. I am running Visual Studio 2005 and C# 2.0.
I use the Chart object's SeriesCollection to add my comparing series to each chart.
On my own computer, everything works fine, but when I try to run my program from other computers, I have this problem:
The data is exported fine, but when creating charts, only the last Series object I added to the SeriesCollection of my Chart is being displayed; as I mentioned before, I use three columns of my data to create three lines in my chart, but only one line appears.
Can anyone help me?
Thanks in advance...