nddeapi.exe is part of a product called known as HP DesignJet Utility and the developer is HP Development Company, L.P. .
If you think that this file contains a virus or another malware, please download a virus scanner.
If nddeapi.exe is using too much CPU or too much memory in your system, it is possible that your file has been infected with a virus. Installing an antivirus is recommended.
Not all processes can be uninstalled without the help of a 3rd party tool, especially malware. To see if it can be uninstalled, first go to Start > Control Panel > Add/Remove programs and select HP DesignJet Utility from the list to remove the process nddeapi.exe from your computer.
If you have any problems with nddeapi.exe, you may try using a registry cleaner or a speed-up software to check, analyze, and fix problems that are affecting the performance of your computer.
You may try contacting HP Development Company, L.P., the developer of nddeapi.exe and ask for more information.