G,

See
http://www.apteryxware.com/dental/knowledgebase/topics/HELP__Socket_Notification
_Sink_Error_Being_Generated_By_Windows.htm

HTH
MH

Relavant bit

RESOLUTION: computer users

To date, there have been several steps that have reduce the frequency of the
error or have eliminated it altogether. The following steps are ordered in
the frequency in which they seem to have corrected the sink error. Please
note that that several of the following steps are advanced and may result in
creating problems if performed by users not skilled at working with
computers. Apteryx takes absolutely no responsibility for any problems that
may result by following the advice presented in this documentation.
Update the application or service that is generating the error. Depending on
how the sink error is generated, you may or may not be able to determine
which application or service generated the problem.
If the previous step does not correct the error (of the application/service
could not be determined) then update your computer's NIC device drivers and
any other network adapter drivers you may have on your computer (be sure to
include any "internet service provider" software that may be active on the
computer). For more information on updating device drivers, please refer to
Window's online help about using the Device Manager or consult the
documentation that came with your hardware.

"If this a new PC then the above shouldn't be an issue and I would consider
taking it back to where you bought it and let them sort it out for you".

If the previous step does not correct the error then check the TCP/IP setup
of the computer and make sure that it is installed and properly configured.
If the previous step does not correct the error then look at the services
installed and running on your computer and update as many of those as
possible. These services may be located either under Computer Management or
Services in your Start menu.
If the previous step does not work: download and save the latest NIC driver
updates on your computer somewhere; go into Computer Management or Device
Manager and remove the NIC/network devices from the hardware list (if it
asks you if you want to uninstall anything say Yes); close down and turn off
your computer; physically remove your NIC/network hardware; reboot your
computer; reinstall the drivers for the hardware (even though the hardware
is not plugged in); shut down and turn off your computer; plug your network
hardware back in; power back on your computer and follow the steps in the
new hardware detected wizard.
If all else fails, remove your current network hardware (both from the
device manager and the physical hardware from the computer) and purchase a
new NIC card (we recommend that you stick with a larger manufacturer).

HTH
MH