Solved Win update failed 6 times.

[seven2]

Definition Update for Microsoft Security Essentials - KB2310138 (Definition 1.133.145.0)
Installation date: ‎8/‎22/‎2012 2:25 PM
Installation status: Failed
Error details: Code 80070666
Update type: Optional
Install this update to revise the definition files that are used to detect viruses, spyware, and other potentially unwanted software. Once you have installed this item, it cannot be removed.
More information:
Microsoft Security Essentials - Free Antivirus for Windows
Help and Support:
Microsoft Security Essentials - Free Antivirus for Windows

 

[seven2]

MSE

When I run the program update it works but when I run Windows updates it does not. Should I reinstall or do a system restore?

 

[F5ing]

A System Restore using a recent restore point might work.

But you might want to check this first: Failed to install Definition Update for Microsoft Security Essentials - Microsoft Answers

 

[seven2]

MSE

After applying fixes to no avail, I reinstalled MSE and the update worked.

 

[Saltgrass]

Looks like you made a good decision:

ERROR_PRODUCT_VERSION 1638 (0x666) Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.

 

[seven2]

MSE

Thank you Saltgrass for pointing that out.