Impossible downloading from internet files larger than 2 Gb

The problem I have  is that in my lan I cannot download files (of any kind) larger than 2 Gb.
The LAN is formed of a Domain Controller (with SBS 2003 Premium Serv), a file server (Win 2003 Server)  and around 15 PC.
In the domain controller the software installed is SBS 2003 Premium, that is Windows Server 2003 SP2, Microsoft  Exchange 2003, ISA Server 2000  SP2, SQL Server 2000, Share Point services 2.0 SP3; all software is updated to last  patch available.
I use Internet Explorer 7 or 8 to download the file from internet but  I cannot download file larger than 2 Gb, if  the file is just less tha 2 Gb it is all Ok, if the file is larger than 2 Gb the operation seems to succeed but  Instead I download only a file of few Kb.
This happens on the SBS Server, on the Win 2003 Server and on every PC of the Lan, with PC outside my LAN there is no problem to download files larger than 2 Gb.
Thanks for your help
Gino_TechAsked:
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Shanmuga SundaramConnect With a Mentor Director of Software EngineeringCommented:
Did you try using any download manager tools? Did that make any difference?
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Lukasz ChmielewskiConnect With a Mentor Commented:
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keithdmitchellConnect With a Mentor Commented:
What Roads_Roads posted is correct, however it really isn't practical to download a file via a web browser larger than 1GB. You run the risk of timing out, even if you set the keep alive setting, which is basically the same thing your ftp client will do. You'll be better of seeing if it has a torrent or if it has a ftp download so you can at least append the down (start where it left off) if it times out. Lastly see if the website has an open to use a download manager, as they will help out as well if the connection times out.

Keith D Mitchell, Server Enginner @ Hostmysite.com
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