QuickBooks error code 1618 is usually seen when the user tries to install or update. This error code comes up with an error message stating “Error: There was a problem installing Microsoft Runtime Library (Error 1618)” or “Error 1618: ERROR_INSTALL_ALREADY_RUNNING”. The user encounters such an error when the user tries to run the setup program to install QuickBooks programs. This error can be easily fixed by carrying out certain steps, which will be discussed later in this post. As a consequence of this QuickBooks error code 1618, the user might end up in the system being crashed.
If you are also facing QuickBooks error code 1618, then reading this post till the end would work. However, if you have any query or in case you need any assistance, then do not think much in calling us at any point of time via our toll-free number i.e. 1-800-761-1787. Our team will ensure to provide you with immediate technical support services.
The QuickBooks error code 1618 can be triggered due to the below mentioned factors:

Fixing the QuickBooks error 1618 becomes easy by reinstalling Microsoft Libraries on the system. The steps to be followed here are as follows:
We hope that the information that we have mentioned in this post might work in fixing the QuickBooks error code 1618 successfully.
However, if the error continues to trouble you even after carrying out the above stated steps, then in that case simply ring up to our QuickBooks enterprise tech supportteam of technically sound accounting professionals and let them carry out the required steps.
Press CTRL + Alt + Delete keys on your keyboard simultaneously and hit Task Manager.
Open the Processes tab on your computer.
Now click the Image Name column to set the list in alphabetical order.
Search the processes named MSIEXEC.EXE and terminate them by clicking on the End Process button.
Close the Task Manager window and try to install the application.
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Peter