Hi Antoni,
If you could run our diagnostic tool and post the output as a reply to this post, we will be able to review it and let you know what the issue is and what steps you can take to resolve it.
1) Logon to the PC that is experiencing the notifications as a user with ADMIN rights.
2) Download the tool: http://go.microsoft.com/fwlink/?linkid=52012 click RUN.
3) When the tool loads, click CONTINUE.
4) Is the RESOLVE button available? If so, please click RESOLVE to allow the diagnostic tool to repair the issue.
5) From the Windows tab, click the COPY button.
6) Reply back to this post and PASTE the entire results into the post.
We look forward to assisting you.
Thanks,
Michelle