Why do i get a check sum error after downloading for anti spy?

I'm using win 2000 msie 6.5 , I do not use a firewall or virus software.

Why do i get a check sum error after downloading for anti spy?adware remover

Could be a few things. The latest Anti-Spy button has a blue shield with a grey outline. The old Anti-Spy used an orange square with a red target (Version 6 of the Y! toolbar, the one with the pencil). Anyhoo, I suggest the following. If you are using Version 6 of the Y! toolbar, then uninstall the toolbar (make sure IE is closed) and re-install from toolbar.yahoo.com to upgrade to Version 7 of the Y! toolbar. Next click the settings button (avatar) on the Y! toolbar, click Add/Edit buttons, click Button Gallery and add the Anti-Spy button (shield) and save changes. Click the Anti-Spy button and download/install the software (hopefully you won't get the checksum error). If you are on Version 7 of the Y! toolbar, then uninstall Yahoo! Anti-Spy and/or CA Yahoo! Anti-Spy and try it again.

Added 3/25/08:

CA shows system requirements for windows 2000 as SP4+

Why do i get a check sum error after downloading for anti spy?antivirus protection

the latest anti spy can't match your operating system.