If your Mac is running great right now thats terrific. But like most users, you will add new software, set prefs, move things around, currupt some files etc. Each user folder is unique in that it holds all the settings apart from other users. When something quits working right it is good to have a clean user folder on hand for testing.
For instance you installed a new application or downloaded some files two days ago. Now when you double click on a file the computer locks up or an application crashes. What could be causing that? Is it the application or is it a setting the application created in your user folder.
If you have a test user account you can now login to that test user and repeat the same steps. If there are no crashes then you can narrow it down to something you just installed.
Go to the System Preference. Create a new user called Test and give it Admin privileges. Thats it.
