Hi Alan :-)
Try the following and see if it helps:
My proxy settings disappear every time I log on.
http://inetexplorer.mvps.org/archive/answers.htm#proxy
also...
Proxy setting errors or "Detecting Proxy Server"
Go to Tools> Internet Options>Connections
Click the Lan settings button.
Uncheck "Automatically detect settings"
It is also possible that some type of spyware or malware on your system that
is causing the problem. Check the information here and make sure your
system is free of any scumware.
Dealing with Unwanted Spyware and Parasites:
http://mvps.org/winhelp2002/unwanted.htm
Be aware, there are many types of scumware that your antivirus and some
removal tools cannot detect or remove. Therefore, use the programs as
described in the instructions here. Some variants can continue to replicate
themselves each time your computer starts up if not properly removed.
Hope this helps.
Jan

MS MVP - IE [DTS/AumHa]
Smiles are meant to be shared,
that's why they're so contagious.
Replies are posted only to the newsgroup for the benefit or other readers.
How to make a good newsgroup post:
http://www.dts-l.org/goodpost.htm
> Hello:
>
> Sorry for missing information, I am using WinXP Pro with SP2. I have
> make sure the proxy setting is in correct format.
> http://aaa.bbb.com port is 80 without any space or \\
>
> Thanks!
>
> Jan Il wrote:
>
>>Hi Alan :-)
>>
>>You do not tell us the version of WIndows you are using, but, you might
>>try
>>the following and see if it will help:
>>
>>Go to Tools> Internet Options>Connections
>>Click the Lan settings button.
>>Uncheck "Automatically detect settings".
>>
>>My proxy settings disappear every time I log on.
>>http://inetexplorer.mvps.org/archive/answers.htm#proxy
>>
>>