How to reduce setup file size

Hi,

I have an application developed C# 2.0.
It uses MS Office dll's for Office interop(Outlook and Excel).
When i created Setup project using VS 2005, file is about 15 MB. (Even if did zip also, almost same)
After installing it in a system, total application folder is taking around 30 MB.
These are the files and their memory in the application folder.
EXCEL.EXE  -  9.6 MB
Interop.Excel.dll  - 1 MB
MSO.DLL - 11.6 MB.

Remainig all are application files.
Is these files are required, to work with MS Office?
Or did made any mistake while adding references?

Since this application is downlodable from internet, i want to reduce the file size as much as possible.

Thank you.

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