[solved] Nexus 7 not recognized by Windows 8.1

[Beja]

Thanks all.. the solution is here:
http://www.asus.com/support/Knowledge-Detail/28/2/Nexus_7/D53452AE-143C-42F1-BDC1-7F168085F0D7/

Hi all,
Suddenly Nexus 7 is not showing in my computer when connecting by USB.. anyone had the same issue and solved it?
Thanks