This means the installer tries to update a file that is currently in use by another program.

Just click on 'ignore' and let the installation continue.

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

Click on 'ignore' and let the installation finish. Everything will work, except for the Matroska Splitter.

You are probably getting this error because there are one or more crucial Windows components missing on your system. Most likely comctl32.dll or DCOM.

* If it is an .avi file, open it in the GSpot tool. There you can see which codecs the file needs.

* You can also try to re-install the K-Lite (Mega) Codec Pack. Read the information at the beginning of the installation to see what components you might need. Not all components are enabled by default on the components screen, so you might need to enable some.

If you have a NVidia GeForce graphics card, then you should update it's drivers.

* Make sure you are using a player that is capable of displaying subtitles. For example Media Player Classic.

* Make sure DirectVobSub is installed.

* You should enable the option called "enable all streams" in the Ogg splitter.

Start > Programs > K-Lite Codec Pack > Configuration > Codec Tweak Tool

You need to disable the internal audio switcher of Media Player Classic.

Options > Filters > Audio Switcher

Install the following packages from Microsoft:

Windows Media Format 9 runtimes
Windows Media Codecs
Windows Media Codecs

That means that the file is DRM protected. DRM is a copyright protection method. You generally need to get (read: buy) a license to be able to play the file.

This is a 'bug' (or limitation) in Media Player Classic.

The only way to replay the file is to re-open the file.

Rename the file from .rm to .rmvb

First make sure you have properly installed the K-Lite Mega Codec Pack or Real Alternative.

Secondly, make sure you have a recent version of Microsoft DirectX installed.

Thirdly, there are some settings for Media Player Classic which you can change. Open Media Player Classic and in the top menu go to:

View > Options > Playback > Output

Try putting the settings for 'RealMedia Video' and 'DirectShow Video' to 'system default'. Close Media Player Classic and try to play your file(s) again.

View > Options > Player > Formats

Try putting 'Real-Time Streaming Protocol handler' to RealMedia.

You need to have the K-Lite Mega Codec Pack or Real Alternative installed. The 'RealMedia DirectShow filter' and 'RealMedia codecs' that come with these two packages are required.

Now change the following file types so that they open in Windows Media Player:

.ra .rm .ram .rmvb

See the above topic for how you can change a file type.

Start > Run > type regedit and press enter

Navigate to:
HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers

If there is an entry in there with the name DivX in it, delete it.

Now navigate to:
HKEY_CLASSES_ROOT\SystemFileAssociations\.avi\shellex\PropertyHandler\
Delete the value (default). It will then appear as an empty value.

Close the registry editor and reboot your computer.

Open the Windows Explorer (hold WindowsKey and press 'E')

In the top menu go to: Tools > Folder Options > File Types

Now select the file type that you want to change and click on 'change'. Select the program that you want to use to open the selected file type and press OK.

If the file type is not yet in the list, then click on 'New' add it to the list yourself.

Start > Run > regsvr32 /u shmedia.dll

Start > Run > regsvr32 /u shmedia.dll

Start > Run > regsvr32 /u shmedia.dll

Uninstall it and then re-install it, but now deselect the I.263 and Indeo codecs.

Take a look at the guides section of Doom9.org