The Fltlib.dll file is crucial for a number of operations in the Windows operating system. It is used for the Windows 8, windows 7, Windows Vista, Windows XP and Windows 2000 operating systems. In case of any sort of corruption or alterations in the Fltlib.dll, you will get an error message and some functions might not even work. The corruption might arise from a number of causes but Ad-ware installation is the most common. In case you keep on getting the Fltlib.dll error message, the solutions is rather simple. Reinstall the dll file. To get the Fltlib.dll, follow this link for the download.