How to Remove Old DLL Files That Are Still Running

1. Determine that the DLL files are malicious or unnecessary before going forward. Removing a DLL file that pertains to the operating system or another program could cause the application or system itself to stop functioning.
2.
Press the 'Start' button and click 'Run.' In the 'Open' box, type 'cmd' and click the 'OK' button. The command prompt window will open.
3.
Type 'cd' and then press the space bar. Type in the complete file path of the DLL file. Press the 'Enter' key.
4.
Type 'regsvr32 /u' followed by a space and then the DLL name. Press the 'Enter' key. This will unregister the DLL file.
5. Run the antivirus and spyware removal programs on the computer to rid it of any remaining malicious files.