~dp1fe.dll file is a registry key that runs in the Windows registry.  It is a .dll file, which stands for “direct link library”.

Direct link library files run through the Windows registry.  The registry is there to keep executable files’ functions from dispersing themselves all over the system, which would prevent many programs from running at one time, and often slow the computer speed to a crawl.

Sometimes the computer’s running speed is reduced to a crawl regardless.  There can be many reasons for this.  Out of date files and files that do not uninstall correctly are one major reason for this.

~dp1fe.dll and other files like it in the directory can also be damaged by viruses, spyware, Trojans, and other malware programs.  These programs sometimes damage registry files, and sometimes even kick them out of the registry as they try to disguise their own malicious process files under legitimate names.

While anti-virus and anti-spyware programs can often remove a threatening program, they unfortunately do not repair the registry files.  You need a registry cleaner for that.  Feel free to take advantage of a free scan from REgZooka.