Network error when installing SQL Server 2008 Enterprise

Hi guys, I'm trying to install an SQL Server 2008 Enterprise on Windows Server 2008 R2 Standard and I've got an network error:

TITLE: Microsoft SQL Server 2008 Setup
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The following error has occurred:

A network error occurred while attempting to read from the file: C:\Publico\en_sql_server_2008_enterprise_x86_x64_ia64_dvd_x14-89207\x64\setup\x64\SQL93C3.tmp.msi

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=10.0.1600.22&EvtType=0xDF039760%25401201%25401

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BUTTONS:

OK
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I don't know why a network error, because I'm intalling from an local .ISO file.

Thanks,
Luciano