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Have three computers both with windows 7 connected to each other with a TRENDnet gigabit switch, have a folder on computer A that is set as shared folder under the advanced sharing settings for the folder. When I copy from computer A to Computer B the process barely takes a second. When I copy from computer A to Computer C its the same story almost no time to copy.

The problem is when I copy from computer B to Computer A. It takes more than 5 minutes to copy the same file. This problem doesn't occur when copying from computer C to computer A, it is only when copying from Computer B to Computer A

The speed when doing this is around 13.2 KB/second even though all computers have gigabit cards and its a gigagbit switch.

I have tested with both computers B and C doing a transfer to computer A and computer B is going at 13.2 KB/second while computer C is going at ~50 MB/second

Computer A has kaspersky anti-virus installed but I disabled it, and all computers have microsoft security essentials installed. EDIT: tested another thing, I made a shared folder on computer B then went on computer A and copied from the shared folder on computer B to computer A and it worked perfectly fine at around ~70 MB/second.

so in the end the only problem is copying TO computer A's shared folder FROM computer B which seems strange to me and I'm guessing has something to do with the settings of the shared folder and not the network.

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On your computer-B, try changing the network-adapter's duplex mode from Auto to 10-Full mode. I've seen many bandwidth issues resolving after this little fix. Also, on both A & B, monitor the usage of all applications that might be clogging your network on open ports. You can do this by running resmon.exe (Resource-monitor) on windows-7. –  Prahlad Yeri Aug 7 '12 at 0:04

2 Answers 2

Just a guess but Antivirus? In particular, does either Computer A or Computer B have two conflicting antivirus products installed?

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computer A has kaspersky installed but I disabled it when I started testing to try to see what was wrong, also they both have Microsoft Security Essentials. –  Luis F Hernandez May 23 '12 at 15:13

Change the machine(s) tuning settings, there are known bugs with how W7 negotiates that can cause transfer slowness.

netsh interface tcp set global autotuning=disabled (or highly restricted)

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