Recently group of our users was affected by Critical Error 106. This issue is related to User Account Control turned off.
To turn UAC on
Open User Account Control Settings by clicking the Start button Picture of the Start button, and then clicking Control Panel. In the search box, type uac, and then click Change User Account Control settings.
To turn on UAC, move the slider to choose when you want to be notified, and then click OK. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
Please notice that this is currently a temporary solution while we are looking for a permanent one.