nkdusd.dll is a process belonging to the Nikon STI USD Driver program . Nikon STI USD Driver "This process is still being reviewed. If you have some information about it feel free to send us an email at pl[at]uniblue[dot]net"
Check that nkdusd.dll is stable on your computer.

We currently do not have a security rating fornkdusd.dll. Send feedback at pl[at]Uniblue[dot]com, to contribute to this dll information page. It is highly recommended to run a FREE performance scan to automatically optimize memory, CPU and Internet settings.

Determining whether nkdusd.dll is a virus or a legitimate Windows DLL depends on the directory location it executes or runs from. Click to Scan your PC including nkdusd.dll to Detect any Security Threat.