KB2976978 (optional) was successfully installed in 1st computer on 2/june/2015. It is right now being offered once more  (still optional). Should I either install or hide it?

In my opinion you should install as the last review was on  07/07

Install optional updates ONLY when you solve a specific problem.

If you really need optional update, download it and install it manually. Check content of WindowsUpdate.log.

In the case of install problem configure clean boot and disable AV program.

HTH

Milos

Install optional updates ONLY when you solve a specific problem.

If you really need optional update, download it and install it manually. Check content of WindowsUpdate.log.

In the case of install problem configure clean boot and disable AV program.

HTH

Milos

• Proposed as answer by Roger LuMicrosoft contingent staff, Moderator 22 hours 19 minutes ago
• Unproposed as answer by __arpoador 41 minutes ago

Install optional updates ONLY when you solve a specific problem.

If you really need optional update, download it and install it manually. Check content of WindowsUpdate.log.

In the case of install problem configure clean boot and disable AV program.

HTH

Milos

• Proposed as answer by Roger LuMicrosoft contingent staff, Moderator Wednesday, July 08, 2015 9:04 AM
• Unproposed as answer by __arpoador Thursday, July 09, 2015 6:42 AM

Install optional updates ONLY when you solve a specific problem.

If you really need optional update, download it and install it manually. Check content of WindowsUpdate.log.

In the case of install problem configure clean boot and disable AV program.

HTH

Milos

• Proposed as answer by Roger LuMicrosoft contingent staff, Moderator Wednesday, July 08, 2015 9:04 AM
• Unproposed as answer by __arpoador Thursday, July 09, 2015 6:42 AM

Install optional updates ONLY when you solve a specific problem.

Things are not so simple.

Windows Update tool can check which updates are installed (either successfully or not) in a computer (this is a must for it check for new updates).

Even though I have a specific KB successfully installed, WU is offering the same KB to be installed. Why?
I see some possibilities:

    1- WU checked that the KB already successfully installed must be replaced by a newer one.
    2- WU forgot to check (or failed to check) that the same KB is already installed.
    3- WU is offering the same update just looking for having the old update be replaced, and thus, out of the way, in many computers as possible.

Unfortunately, the WUTeam doesn't say why they are offering the KB again... If they had explained it, I wouldn't  be in doubt. The support web page also doesn't clarify anything. While I'm in doubt, I won't install it, because I don't want to replace a successfully installed KB by itself failing (the risk exist).

What if I did not install Windows Customer Experience Improvement Program and it is not in the Services list. Then I do not need to install KB2976978; is this correct?

Plus I am on a Windows 8.1 x64 computer and am registered for windows 10 upgrade-confirmed.