First eliminate any scumware.
See Dealing with Unwanted Spyware, Parasites,
Toolbars and Search Engines
http://mvps.org/winhelp2002/unwanted.htm
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Print this message and/or Save in your settings folder.
Remember that you did this so that you don't have to
ask why you can't change your homepage in the future.
How to stop home page changes::::::
FIRST
Use your current Anti-virus software to remove any virus.
Update and run spyware/adware/virus programs to clean
computer first.
SECOND
Set desired homepage in Tools > Internet Options.
THIRD
Open Spybot S&D program.
Press the Immunize button.
At the bottom of scroll area find and turn on:
[X] Lock IE start page setting against user changes
(current user).
Make any other desired changes.
File > Exit
Check Tools > Internet Options and find home page buttons
are unavailable. Tried this on 10 pages that ask to
change home page and each was defeated.
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Spybot S&D (free)
http://www.safer-networking.org/index.php?page=mirrors
Ad-Aware 6.0 (free)
http://lavasoft.element5.com/support/download/
Spychecker
http://www.spychecker.com
Pest Patrol (free)
http://www.pestpatrol.com
HijackThis (free)
http://www.spywareinfo.com/~merijn/files/hijackthis.zip
Note that AdAware and SpyBot S & D will each catch some
things the other
won't. Also, each need to be updated before every use,
even when just
downloaded.
http://komando.master.com/texis/master/search/?
q=spyware&s=SS