Hi
I would recommend you to download and install this. It's a free toolkit for Excel using ActiveX. Here, take a look at the palette:

As you can see, you have all the possibility to do anything with an Excel workbook or sheet. You can read from Excel and write to Excel.
You should post what you have done so far and we'll help you.
And you should take a look at the Excel Board. Don't post question there, but take a look at the link people provide there.
Regards,
Even
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Certified LabVIEW Associate Developer

Automated Test Developer
Topro ASNorway