How to Add DLL Files

By Josh Baum

Files with the .dll extension are Windows files known as Dynamic Link Library files. These files are often shared by numerous programs and parts of the operating system, and they contain special instructions for various program actions. If your computer is missing a .dll file that it needs to perform a certain function, it will typically send you an alert message to let you know that you need the file before you can proceed.

Step 1

Reinstall software that prompts messages of missing .dll files. Many pieces of software install .dll files on your computer as you install the software itself, and it could be that one of these files has been accidentally deleted or corrupted. Reinstalling the software can add or replace these files and often resolves .dll problems that only occur when using a specific software title. If this doesn't add the .dll files you need, proceed to the next step.

Step 2

Visit a Web site that contains thousands of .dll files available for free download. A link to one such site can be found in the Resources section below.

Step 3

Search the site for the .dll files you need. Make sure you read the file details in your search results to confirm that you've found the files you need.

Step 4

Download the .dll files you need.

Step 5

Move the .dll files to the system folder. The location of this folder varies by the version of Windows you are using. In Windows 95, 98 and ME, the folder path is "C:\Windows\System." In Windows 2000 and NT, it's "C:\WINNT\System32." The path for all 32-bit versions of Windows XP and Vista is "C:\Windows\System32" and the path for 64-bit versions of these operating systems is "C:\WindowsSysWOW64."

Step 6

Reboot your computer.