Please see the suggested work around from MicroFocus :
There is an error named 'the specified account already exists' when a program is trying to be uninstalled from a machine with Windows OS. The issue got reported when trying to uninstall UFT, yet the error message comes from the Operative System (Windows) itself and not by the tool/program/patch/update/etc. Meaning it can appear with any software which is trying to be uninstalled.
To troubleshoot this errors there are 2 methods:
1-Running the setup.exe of the software and try to unistall (or install) from its wizard to verify if it is indeed installed in the machine. Since this error happens because of the package is damaged or altered somehow.
2-There is a tool which helps to solve this problems. The link of that tool is here:
For reference, please check the below article: