UnDLL is a specific application created

UnDLL is a specific application created for Windows XP and Windows 2000 which allows you to remove any DLL (Dynamic Link Libraries) from Windows’ memory. Most of the virus and spyware infect DLLs besides infecting executables. UnDLL is a specific application which allows you remove the infected DLLs, search for infected threads, and clearing the registry so that you don’t get any DLL errors.

Notice that this application doesn’t finds infected DLLs. You’ll have to find the infected DLLs yourself. Once you find an infected DLL, you can use this app to remove it. See the following log:
07/25/2008 13:50:26 [SysLog]: UnDLL engine 1.0.0.2 initialized
07/25/2008 13:50:26 [SysLog]: OS: 5.1 build 2600 (Service Pack 2)
07/25/2008 13:51:15 [Action]: + Searching for infected threads…
07/25/2008 13:51:20 [Action]: Deleting file [C:\YoutubeGet\VB6STKIT.DLL] - OK
07/25/2008 13:51:22 [Action]: + Searching in AppInit_DLLs…
07/25/2008 13:51:22 [Action]: + Searching in Winlogon Notify…
07/25/2008 13:51:22 [Action]: + Searching in Browser Helper Objects…
Remove Infected DLLs
It neutralizes the DLLs from the system’s memory, unloads them, deletes them, and removes any traces of them from the Windows Registry. To complete the operation, you’ll need to restart the system.
When you remove the infected DLL it is recommended that you download and place the removed DLL from someplace like DLL-Files.