Ref: http://tomfusion.com/blog/?p=69

Quick tip for Visual Studio SharePoint developers.  When you remove a web part from your project and you try to deploy it again you will get this error.  To solve it, simply edit the manifest.xml file in the \pkg folder in your project folder and remove the reference to the item that has been removed:

Remove the item from the manifest.xml and save.
Now the project should deploy as it should.

Note: Before performing these operations make sure you backup all Share Point databases and create a backup of the registry.

a) Disable and Stop the following services

-Microsoft Single Sign-on Service
-Office SharePoint Server Search
-Windows SharePoint Services Administration
-Windows SharePoint Services Search
-Windows SharePoint Services Timer
-Windows SharePoint Services Tracing
-Windows SharePoint Services VSS Writer

b) Note the following registry keys:

From HKLM\Software\Microsoft\Office Server\12.0
-Install Path (default is C:\Program Files\Microsoft Office Servers\12)

From HKLM\Software\Microsoft\Shared Tools\
Web Server Extensions\12.0
-Location (default is C:\Program Files\Common Files\Microsoft Shared
\Web Server Extensions\12)

c) Delete the following registry hives:

HKLM\Software\Microsoft\Office Server\12.0
HKLM\Software\Microsoft\Shared Tools
\Web Server Extensions\12.0

[x32] – HKLM\Software\Microsoft\Windows
\CurrentVersion\Uninstall\OSERVER
[x64] – HKLM\SOFTWARE\Wow6432Node\Microsoft
\Windows\CurrentVersion\Uninstall\OSERVER

d) Delete the following folders:
The value of the InstallPath key
The value of the Location key
C:\%CommonProgramFiles%\Microsoft Shared\SERVER12
Restart the server and perform an installation as normal.
Before running the configuration wizard, follow the steps as follows
You need to restore the Server Language registry value by
creating the following .reg file (open notepad and paste the following):

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
\Shared Tools\Web Server Extensions\12.0 \ServerLanguage]
“1033″=”"

-Save this as fixlanguage.reg and upload it to your server.
Double click the file and say yes to the prompts.

Referred URL:

http://fmshaon.blogspot.com/2006/11/how-to-install-windows-media-player.html

Windows Media Player 11.0 is the latest Media Player by Microsoft. It offers great new ways to store and enjoy all your music, video and pictures along with its new cool look. You must have Windows XP Service Pack-2 (SP2) in order to install Windows Media Player 11.0. But still you will face a problem while installing this new Windows Media Player if your copy of Windows XP is not a genuine (non-pirated) one, since WMP 11.0 installation requires genuine windows validation!!!

But there are some tricky steps through which you can install WMP 11.0 even in your pirated copy of windows XP bypassing the genuine windows validation. You just have to follow the following steps one by one:

1. Download Windows Media Player 11.0 (make sure its the final and latest version, not beta) from the Microsoft Site. Alternatively, you can download the installer file directly from here. Remember you can’t install Windows Media Player 11.0 if service pack 2.0 is not installed in your operating system.
2. Extract the downloaded Windows Media Player setup file (wmp11-windowsxp-x86-enu.exe) using WinRAR to a directory (wmp11-windowsxp-x86-enu). Now make sure you have a “LegitLibM.dll” file in the extracted “wmp11-windowsxp-x86-enu” folder.
3. Download the patched LegitLibM.dll and then copy-paste it to the “wmp11-windowsxp-x86-enu” folder and click yes when asked to overwrite.
4. Now run “setup_wm.exe” file in the “wmp11-windowsxp-x86-enu” folder.
   
5. Restart your PC, then run your Windows Media Player and you are done!!!

Referred URl:

http://www.technipages.com/how-to-find-the-codec-your-avi-video-file-needs.html

1. Download qaviinfo.exe and save it to the same folder that your AVI file is located. Mine is at C:\Downloads for this example.

2. Open a DOS command prompt (Start > Run > CMD) and navigate to that folder. Type CD C:\Downloads.

3. The name of the video file in my case is presenta.avi. So I can now type qaviinfo presenta.avi.

4. A list of information about the file will be displayed. In the Codec column you can see what codec is being used. Here it is FMP4.

5. A Google search on FMP4 revealed to me this link. Which then led me to The Codecs where I found a download for a file that included the FMP4 codec.