They are 'throttling" the update as they typically do when they see issues with an update. For those that have installed it and see no issues (as I have here personally) there is no need to uninstall the update. For those that see it unchecked, leave it
be and it will be 'unthrottled' at a later time.
I am one of the many who have no problems, be it Windows 7 x64, Windows 7 x86 or Windows 8 x86 - I have this update installed on all three. All of them are licensed systems installed clean form Microsoft media though - which goes a long way explaining why
there are no problems. There is a caveat that third party software can go haywire anytime the kernel is updated, expecting something to be there which gets moved or removed. I have encountered none so far on my installations.