So, you installed Windows 7/Windows Vista and Internet connection is working fine, and you can browse web sites normally,
Windows Live Messenger/some other network or Internet activity times out!
This symptom is due to the "TCP/IP Auto-Tuning" in windows 7 and Windows Vista, which is not compatible with some network devices.
to disable TCP/IP Autotuning, open elevated command prompt, and run the below command, and then reboot your PC:
netsh int tcp set global autotuninglevel=disabled
This should disable TCP/IP Auto-Tuning and solve your problem.
Note: In case you want to undo this command for any given reason, open elevated command prompt, and run the below command, and then reboot your PC:
netsh int tcp set global autotuninglevel=normal
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