Newton-Willbanks Engineering, Inc.

Problems with Windows Defender Update Process

For the last week or so, I have been getting a reminder that Windows Defender needs to update its signature file. I've tried to update it countless times, but it never works. After some research I discovered that this is a fairly common problem. The current signature file needs to be removed.

Use the following steps to remedy the problem:

1. Click Start, click Run, type: Msiexec /x {A5CC2A09-E9D3-49EC-923D-03874BBD4C2C}

2. Click OK when it asks if you want to uninstall..

3. Open Windows Defender and check for new definitions:

Click the Help options arrow next to the Help icon.

Click About Windows Defender.

Click Check for Updates.

That should do the job.