I have found a solution here: https://bugs.archlinux.org/task/41951
Updating the virtualbox extensions to 4.3.18 solved the problem and my win7 guest works again.
Old version of the extensions was 4.3.6 New version now matches the virtualbox version: 4.3.18 (get yours here: https://www.virtualbox.org/wiki/Downloads)
I have found a solution here: https:/ /bugs.archlinux .org/task/ 41951
Updating the virtualbox extensions to 4.3.18 solved the problem and my win7 guest works again.
Old version of the extensions was 4.3.6 /www.virtualbox .org/wiki/ Downloads)
New version now matches the virtualbox version: 4.3.18 (get yours here: https:/