SEP11 seems to be blocking large network file transfers

New Computer
XP Pro on a domain
recent installation of Symantec Endpoint11

When I tried to copy large email files (5+ GB) and other large files from the network to this new PC the PC basically freezes.  I can move the mouse but it won't let me open any other applications, not even Task Manager.

I have re-installed SEP11 but removed the "Network Protection" module but the problem remains.

I tried another file copy from a PC on our network to this new PC.   Before I started the transfer I opened  the Networking tab in Task Manager.  The files start to copy and you can see 75% network utilisation, after some time this just drops to ZERO.  

I have tried another network cable and network switch.  The problem remains.  I believe it is related to SEP11.  I completeley un-installed SEP11 and I seem to be able to transfer files OK.

Are there settings in SEP11 that I should adjust?
yellerAsked:
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yellerAuthor Commented:
Problems seems to be one of the boot up applications
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cybrexusCommented:
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yellerAuthor Commented:
I remove SEP11 and install AVG free, as a test.  The file transfes seems to improove but pretty soon the  same problem happened.

I will try to go to MSCONFIG and eliminate each startup item , one by one. Hopefully that will allow me to find the answer.
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