Internet Server NT Service belongs to Dell OpenManager Server Administrator (OMSA). As the service is crashing rather than just stopping, the install may be corrupt. I suggest logging in as the Administrator and uninstalling OMSA, then do a fresh install.
I suggest ask in Dell support forum.
Dell.com » Community » Support Forums » Servers » Systems Management Forum
http://en.community.dell.com/support-forums/servers/f/177.aspx