Hi AndreaInvernizzi,
Thank you for posting in the Microsoft Community.
Apart from the issue, how are you doing today?
You want to know if you can use the Xbox controller without the receiver. This can be really frustrating for you and I appreciate the efforts that you have put in. Let us work together as a team and try to get this issue fixed.
Let us start with few questions-
1) What is the KB article number of the update causing the issue?
2) Have you made any other changes on the computer?
I would like more information regarding the issue.
Method –
I would have contact Xbox support for further assistance.
Refer the link-
Xbox support
http://support.xbox.com/en-US/
You may also post your query in the Xbox Forums as well.
Refer the link-
Xbox Forums
http://forums.xbox.com/xbox\_forums/b/default.aspx
Additionally, refer the article for further assistance-
Xbox controllers, headsets, and wireless accessories
http://support.xbox.com/en-US/xbox-360/accessories/controllers-remotes
Do let us know if you need further assistance. We will be happy to help. We, at Microsoft strive towards excellence.
Thanks.