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Step 1
Click the "Start" button in Windows and select "Search" from the Start Menu options. In the Search window, click the "All files or folders" link, and then type the name of the .dll file you want to delete in the search field. Click the "Search" button and wait for the search to complete.
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Step 2
Find your unused .dll file in the search results. Look at the file path for the .dll file, which should be displayed with the search results. Write this file path down exactly. Most Windows .dll files have a file path that looks something like "C:\Windows\System32\filename.dll."
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Step 3
Right-click on the file you want to delete and select "Delete" from the options. This will move the file to the Recycle Bin.
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Step 4
Left-click the "Start" button in Windows and select "Run" from the Start Menu options. In the Run window, type "cmd" and click the "Run" button to open the command prompt.
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Step 5
Type "regsvr32 /u C:\filepath\filename.dll" in the command prompt, but substitute the file path and file name of your specific .dll file for the placeholders used above. For example, if you want to un-register the file "file.dll" from the directory "C:\Windows\System32," you would type "regsvr32 /u C:\Windows\System32\file.dll." Press the "Enter" key after typing this command to un-register it from the Windows file registry. Once you've done this, the file is completely deleted.
