The aacntx.dll error refers to an issue with a process of the Amicus Attorney program from Gavel & Gown Software, Inc., and may be related to a virus on your computer. The way to know if it is a virus is to isolate the location that aacntx.dll is running from on your computer.
You may be tempted to do a manual search of your hard drive, but even computer repair professionals do not use this approach. The easiest way to uncover problems with Dynamic Link Library (DLL) files like this one is to have your computer scanned. To begin this process, click below.
Finally, the best way to repair this error is to install and run a competent registry cleaning software like ZookaWare PC Cleaner. Various websites offer free downloads of individual DLL files, but without detecting the exact issue with your file, you will simply be adding to the problem by downloading another file into an already cluttered registry.