What is it?
Shell Document Object and Control library - shdoclc.dll
What does it do?
Shdoclc.dll (the Shell Document Object and Control library) is a resource-only library that is used by Internet Explorer to store localized items such as menus, dialog boxes, and strings.
Microsoft's information page.
You'll want to keep an eye on this google search for any known viruses. The normal location of this file is C:WindowsSystem32shdoclc.dll