mydll.dll is a dynamically linked library. In simple phrase, it is an essential component of a particular parasite. Most threats depend on such libraries and wouldn't work without them. The mydll.dll file can be responsible for the dangerous payload a parasite carries, so deleting it will definitely reduce all the security and privacy risks.
The mydll.dll file is installed and used by adware
AdvSearch and
ActualNames.
You have to delete the mydll.dll file immediately after you have found it. The parasite will continue to violate your privacy and harm your computer unless mydll.dll and all related objects will not be completely removed from the system. If you have difficulties erasing the file consider using an anti-spyware program.
Please note that the mydll.dll file actually may be a fully legitimate part of the operating system or legitimate software. Often parasites use files with unsuspicious names, but malicious functionality. You should always carefully check the file before deleting it. It may not be related with malware, but can be required by your essential programs to work properly.
