The a0004070.dll file is a part of Microsoft Jet xBase ISAM, a process in the Microsoft Jet database. Microsoft is a well-known PC software company that is not known to pose any security threats to your computer.
An error in the DLL files indicates a problem in the removal or installation of the program. If the download was interrupted, the DLL files may show errors until the installation is repaired.
In other cases, malicious downloads from questionable websites will plant themselves in your registry and slowly corrupt, damage, and delete files until your system crashes.
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