Yep.

Maybe it tries to update IE plugin, don't know.

I've checked:

- in Opera and FF flash version is 11.2.202.228

- in IE there were no flash plugin at all [1], so I've installed latest - 11.3.300.257

Still the same "Windows Update encountered an unknown error".

b.t.w. 6BA (0x000006BA) code is for 32-bit version and 80070661 (0x80070661) is for 64-bit.

And I've tried Microsoft FixIt. To no avail.

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[1] now I have no clue, how it happened to appear in Win Update,

     though I could have updated IE from 8 to 9 at some point before November 2011,

     and plugin got lost in the process (?)

Update4: Most likely the problem is on our side, see  my post below.

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Thanks, Jeromie, it has worked. [see update below]

However, it would be interesting to know what gone wrong and how could I prevent this.

Also, I don't know how Flash updates work, but it would certainly be good, if I could update from my Windows Update server.

Consider my company: most users (about 250) have weekly internet-traffic limit of about 50 MB (no problems with bandwidth, only to force people not to visit entertainment sites).

Hence, most users will ignore Flash Player updates, just to save few precious MBs.

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Update:

Errors have returned few hours later after reinstall [1].

I've noticed that update process passes "download" and "creating recovery point" phases,

and error occurs on about 30% of installation of 32-bit plugin update.

If you'll point me at some system log, I'll be happy to provide more info.

Update3:

Maybe the problem is in our  Windows Update server ?

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[1] I've unistalled both "Flash Player 11 Plugin" and "Flash Player 11 ActiveX",

     maybe I should have also uninstalled AIR ?

     Edit2 I've uninstalled both and then rebooted once. Maybe I should have rebooted

     after each uninstall (i.e. 2 reboots in total)  ?