Try to add your sharepoint site to trusted sites and Local Intranet in IE or ControlPanel menu
Tools >
Internet Options >
Security >
Trusted sites (+2 -
Local intranet) > Add your sharepoint weapps using wild cards
The short NETBIOS names also should be enlisted

Fig.1.1. Adding Sharepoint Sites to Trusted sites in Internet options
Fig.1.2. Adding Sharepoint Sites to Local Intranet sites in Internet options
As a system administrator
you probably want to apply this to all users
Login to DC through account with domain admin privileges and create a package with above settings
Control panel > Add or remove programs > Add/Remove Windows Components > Internet Explorer Enhanced Security Configuration > Uncheck the Internet Explorer Enhanced Security Configuration > Next, etc. to complete wizard
Start > All Programs > Administrative Tools > Active Directory Users and Computers > right-click your domain name (or organizational unit to users of which you want to apply this) > Properties > "Group Policy" tab > New > enter name for the new Group Policy Object > select it > click Edit button> User Configuration > Windows Components > Internet Explorer Maintenance > Security > Security Zones and Content Ratings > Import the current security zones and privacy settings > close all opened windows
Optional: Re-enable Internet Explorer Enhanced and Security Configuration < Add/Remove Windows Components
These changes can take time up to 60-90 min to propagate