Check whether Sharing and Discovery option is turned On or Off in Network and Sharing Center. If it is turned Off, then make it On. After making On also if it doesn’t work, then try to set the optimizations for TCP in Vista.
Run the below command in command prompt on vista 2 system i.e. 64-bit system:
netsh interface tcp set global chimney=disabled autotuning=disabled.
After that, to ensure, reset the default behaviour. To so this, run the below command:
netsh interface tcp set global chimney=default autotuning=normal