Provided information is not enough to diagnose the issue.
May be you can try the following:
1. Check the Application's Event log to get more information about the error "The application has failed to start because its side-by-side configuration is incorrect".
2. Check if you have installed all the required C++ redistributable packages in your machine where Oracle 11g XE is running.
Did you try to search through the forums? seems there has been this similar issue before, probably you can give it a try to see if it works,