WTF now, the win10 are a kind of beta test software, first the activation nightmare now I noticed that 20+ windows apps were stuck on an endless queue at the windows store. bit crappy I have to say, its a whole day that they were stuck trying again and again to be downloaded. What I realised later is that the software distribution database could be corrupted, there is some commands that fix the issue, at least in my case:
winkey + x --> command prompt as admin
then:
update (1/8/15) : deleting the SoftwareDistribution folder did not really solved the issue, what I did not and -so far so good- works :
a manual-reinstall of the default windoze apps solved the things!
winkey + x --> command prompt as admin
then:
- net stop wuauserv (wait a bit there...)
 - cd %systemroot%
 - ren SoftwareDistribution SoftwareDistributionBad
 - net start wuauserv
 - wsreset
 
The SoftwareDistributionBad can be deleted later, in the case is locked/corrupted etc , there is FilExile  that deletes the most of corrupted/bad files.
update (1/8/15) : deleting the SoftwareDistribution folder did not really solved the issue, what I did not and -so far so good- works :
a manual-reinstall of the default windoze apps solved the things!