Vista has a new feature called 'receive window auto-tuning'. In short, this allows Vista to automatically scale the size of each packet of data it requests and receives over a network connection to suit the available bandwidth. Sometimes, older networking hardware may have issues with this new technique and refuse to co-operate, leading to dropped file transfers, slow performance and other weird problems.
If you are experiencing network issues with large file transfers and occasional connection problems with applications like Messenger, you can restrict or disable the receive window auto-tuning feature.
To do this, open a command prompt window with administrative privileges To run a program with Administrative rights:
1)Type the name of the program “cmd” in the 'start' menu searchbar.
2)Right click on the program's icon “cmd” in the search results and choose 'run as administrator.'
3)Now in the cmd type 'netsh interface tcp set global autotuninglevel=restricted' and press Enter.
If this fixes your issues, relax. If you continue to have networking problems, open another administrative prompt and type 'netsh interface tcp set global autotuninglevel=disabled'.
source:-http://hubpages.com/hub/windows-xp-vista-tips-and-tweaks
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