DLL files are very important partin every versions of Microsoft Windows. However, they can sometimes be quite a pain. If DLL files become corrupt or get deleted, one must find a new copy of the DLL and re-install it. This, unlike installing other programs/software, requires registering it within the registry, which may seem like a daunting task.
How To install corevideo.dll
1 Go to the free DLL download website (see link in the Resources) and click "Download corevideo.dll."
2 Click "Save" in the confirmation pop-up, navigate to the location on your hard drive where you want to save the file and click "Save" to begin the download.
3 Right-click the saved DLL file and select "Copy." Go to the "Start" menu, click "Computer" or "My Computer," double-click the "C:" drive, double-click the "Windows" folder and then the "System32" folder. Right-click anywhere in a blank space and select "Paste."

4 Select the "Start" menu, type "run" in the "Start Search" box and hit "Enter." (Windows XP users: Go to the "Start" menu and click "Run.") Type the following command in the search field and hit "Enter" to register the DLL:
Regsvr32 "C:\Windows\System32\corevideo.dll"
Click "Yes" in the pop-up to confirm the registration.
5 Reopen your computer.
But, we did not recommend that you download a dll file from a unknown website for it is very dangerous. A free download may contain ads, malware, virus etc. Now we need to find a rieable software which can help you download dll file and register it. Like SmartPCFixer. It is a professional dll error fix program which can help you install and register dll in 3 steps.
Know more detail: Dll Error Fix
Fix corevideo.dll with SmartPCFixer automatically
Step1, Download and install SmartPCFixer, Launch it.
Step2, Choose "System Fix" on the left side meau.
Step3, Click "Dll Download" Option. Insert your missing or corrupted dll file name. Click "Download" button.
Step3, Enter "Dll Download" Option. Insert your lost or corrupted dll file name. Click "Download" button.
If it did not work, Please runs a free scan on your computer here: Free Scan
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