Codec Guide, your source for quality codecs.
Q:Error during uninstall: "unins000.dat is not recognized by this version of the uninstaller"
A:

The solution is to remove the file and then install the exact same version of the codec pack that you currently have installed on top of your existing installation. That will recreate a proper .dat file, allowing you to uninstall.

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Installation

Q:Do I need to uninstall my old version first?
A:

You can safely install on top of your current version. The installer will detect when it is necessary to uninstall the older version first, and it will offer to do it automatically. This is usally only needed when there have been some big changes, such as added or removed components. In most cases the existing version can be upgraded directly and all your settings are preserved.

Q:At the beginning of the installation I am asked if I want to uninstall program X. Is that required?
A:

No, that is not required, unless it explicitly says that it is required. Simply click 'No' to keep your existing software.

It is however highly recommended to uninstall other codec packs. This to avoid problems and keep your system as clean as possible.

Q:Is it possible to uninstall only a couple components of the K-Lite Codec Pack and keep the rest?
A:

No. You have to uninstall the whole codec pack. Then install it again with only those components selected that you want.

You can however disable (and re-enable) all codecs and filters using the Codec Tweak Tool. This will not uninstall the codecs, but it will effectively disable them.

Q:Is there an uninstaller included?
A:

Yes.

The uninstaller will properly undo all changes that the installer made to your system.

The software can be removed through the Windows Control Panel. You can also find a shortcut for the uninstaller in the Windows Start menu.

Q:"Error writing to registry key"
A:

This registry error will occur when the security permissions for a registry key are incorrect.

To fix the problem, open the Registry Editor:
Start -> Run -> regedit.exe

In the Registry Editor, navigate to the key that gave the error. Right-click on that key and select 'Permissions'. Then make sure that the Administrators group has 'Full Control'.

Q:What is the difference between the available AVI splitters?
A:

Microsoft:
This is the default splitter. It sometimes has problems playing incomplete and truncated files.

LAV:
The advantage of this splitter is that it contains a stream switcher. That is useful for playing AVI files that have multiple audio tracks (which are quite rare) in players that don't contain an audio switcher themselves, such as WMP and Media Center. It also has good handling of strange and broken files. This splitter is used by default by MPC-HC.

Q:Error during uninstall: "unins000.dat does not exist"
A:

The solution is to install the exact same version of the codec pack that you currently have installed on top of your existing installation. That will recreate the missing file, allowing you to uninstall again.

The system restore function of Windows may cause the file to go missing. System restore should only be used to fix your system in extreme situations, such as BSODs or driver issues. You should never use it to undo changes that can easily be undone otherwise, such as removing software.

Q:Symantec Norton antivirus shows a WS.Reputation.1 detection for the installer
A:

This is a generic message that Norton shows for any file that has not been downloaded enough times to build "reputation". It does not mean the file is bad! It simply means it is a new and unknown file. What usually works as a solution is to just wait a few hours and try again.

To completely disable this bogus detection in Norton:
Settings > Detailed Settings > Firewall > Intrusion and Browser Protection > Download Intelligence > Off

How to recover a removed file from quarantine

You can scan any suspicious file with multiple scanners using the free VirusTotal website.

 

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