Working with DLL Errors Using Windows 7 installed in a virtual machine or physical machine, follow these steps to learn about what happens when a DLL is missing:
1. Go to www.winamp.com, and download and install the free Winamp Media Player program by Nullsoft. (Be careful to not accept the extra software the site offers during the download and installation.) Run the software and verify that you can use it to play an .mp3 audio file. Close the player.
2. Go to the C:\Program Files (x86)\Winamp folder and rename the nde.dll file. Start the Winamp Player. What error message did you get? Return the DLL file to its original name and verify you can now use the player.
A DLL is registered using entries in subkeys of the HKEY_CLASSES_ROOT\CLSID key in the Windows registry. Do the following to find out what happens when a DLL is not registered:
1. Create a restore point so that you can recover from any problems you might have with the registry or installed applications.
2. Open the registry editor and locate the HKCR\CLSID key. Search through the subkeys and write down a list of .dll files you find. Close the registry editor.
3. Search the web and find out which application installed on your system uses each DLL you found. Launch the application to make sure it works. Then open a command prompt window and use the regsvr32 command to unregister its DLL. Try the application again. What error message did you get? If you did not get an error, you might not have used a function of the application that relies on this DLL.
4. Use the regsvr32 command to register the DLL and verify the application is working. If you have a problem with this project, you can undo your changes to the registry by applying the restore point you created.
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