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Maybe this helps:

Windows Defender works with the Windows Automatic Updates feature to automatically install the latest definitions. To make sure that Automatic Updates is on, follow these steps: 1.Click Start, click Run, type wuaucpl.cpl, and then click OK. 2.Click Automatic (Recommended), and then click OK.

It is set for Automatic (Recommended), I do the install that it wants me to for Automatic Updates, but it never does anything. When I go back to Automatic Updates, thr same update comes up but says "Downloaded;Ready to Install".

IOWNAPC has been instructed to only have one open support thread at a time. Closed until his current support thread is completed.

Thread re-opened by Zimbo

Zimbo: I followed your instructions and did ATF Cleaner and Regclean.

Alright IOWNAPC,

With this in mind I would like you to go to the following link and check to see if your machine has the ALL the latest windows updates - www.windowsupdate.com

Once you have done that you can take a look at this MS support thread, it may offer some assistance:

• http://support.microsoft.com/?kbid=915105

or

• http://support.microsoft.com/?kbid=918355

On that 1st website you gave me, it says:

Remove the current signature file. To do this, click Start, click Run, type Msiexec /x {A5CC2A09-E9D3-49EC-923D-03874BBD4C2C}, and then click OK.

I do that specifically, and it says:

- Are you sure you want to uninstall this product? I click Yes.

Then it says: "This Installation Package could not be opened. Verify that the package exists and that you can access it, or contact the vendor to verify that this is a valid Windows Installer package."

On the 2nd website it says:

Uninstall the Windows Defender beta 2 definition file, and then replace it with the most current version of the file. To do this, follow these steps: A. Follow the steps in the "Resolution" section of Microsoft Knowledge Base article 915105 to uninstall the current definition file.
915105 Error message after you reinstall Windows Defender Beta 2: “Windows Defender definitions haven’t been updated”

Thats exactly the same thing in the first website. I go to Start;Run; And then type in Msiexec /x {A5CC2A09-E9D3-49EC-923D-03874BBD4C2C} to remove the current signature and it gives me that Error Message.

This problem could be occuring because Windows Defender is BETA right now. The new real version is not out yet.

Did you try running the windows update?