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1.

You might try this. Go to the main Windows Update window and

click on "Installed Updates" (on the left-hand side of the window, at the

bottom), and then remove "Update for Microsoft Windows (KB931099)" (only).

Reboot. Reboot again. Go back to Windows Update, and re-install the same

update, by clicking on the Check for Updates button.

This should essentially re-install Windows Defender on Vista.

2.

1 Go to control Panel and click on Administrative tools.

2 Click on services and a new windows will appear.

3 Look up for windows defender and right click on it, click on

properties and select automatic, it should be on manual, change it to

automatic and click apply then o.k. and will take you back to the

services windows.

4 Windows Defender should be highlighted and on the left hand side of

the services windows, should be 2 links, click restart.

5 Close all windows and open Windows Defender, it should work without a

problem and your popup window at start up will not be display any

longer.

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Wiki User

14y ago

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