Hi JJ :-)
Try the following and see if it helps:
Socket error 11001 - Host not found
Download, install and run WINSOCKXPFIX, available at:
http://www.spychecker.com/program/winsockxpfix.html
and
WinsockXP Fix- WinXP
http://www.spychecker.com/program/winsockxpfix.html
Also, with instructions, at
http://www.iup.edu/house/resnet/winfix.shtm
also
From LavaSoft- all versions of Windows-
http://digital-solutions.co.uk/lavasoft/whndnfix.zip
also ....
(NOTE: It is reported that in XP SP2, the command netsh winsock reset
will fix this problem without the need for these programs.)
also.............
Download a copy of LSPFIX from any of the following sites:
http://www.cexx.org/lspfix.htm
http://www.spychecker.com/program/winsockxpfix.html
This program will enable you to regain your connection.
If these steps do not resolve your problem, please post back to this thread
with the details and any error messages.
Hope this helps
Jan

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> i can't reach some web site but other guys seems no
> problem to reach ...
>
> I hv such error message alerted.
>
> "11001 Host was not found"
>
> Pls advise.
>
> JJ