How Do I Fix DLL in Windows?

Reinstall a DLL
1. Click 'Start,' 'Control Panel' and 'Uninstall a program.' Select the application that produced the error from the list of programs.
2. Click 'Uninstall' from the toolbar. Follow the on-screen prompts to remove the application from the computer.
3. Download and launch the application's installer or insert the install disc into the disc drive. Reinstall the application, and its required DLL, to the computer.
Restore a DLL
4. Click 'Start.' Type 'rstrui.exe' into the search box and press 'Enter' to load System Restore.
5. Click 'Next' on the splash screen. Click 'Show more restore points.' Read the descriptions. Select a restore point that was created before a registry change or the un-installation of an application or service.
6. Click 'Next.' Click 'Finish' to confirm your selection and restore the DLL to your computer.
Re-Register a DLL
7. Log into Windows 7 as an administrator. Hold down the 'Windows' and 'R' keys to open 'Run.'
8. Type 'regsvr32 /i <DLLname>.dll' into the dialog box. Replace '<DLLname>' with the file name assigned to the DLL you want to re-register.
9. Press 'Enter' to reinstall the DLL file to the Windows Registry. Click 'OK' when the message 'DllRegisterServer and DllInstall in <DLLname>.dll succeeded' appears.
10. Restart the computer for the changes to take effect.