If you mean, how do you ensure SketchUp is properly install, then you can Repair it...
Whilst logged into Windows as your normal user-account, ensure SketchUp is closed.
Find the SketchUp installer's exe file - usually in your Downloads folder.
Select its icon, right-click > context-menu > "Run as administrator"
When prompted choose "Repair" [for a new installation choose "Install"]
When it completes restart SketchUp...
Doing the repair should leave any customization as it is - e.g. installed Plugins.
All folder/file permissions should have been reset properly.
The one exception is any customized preferences - like LibFredo's - if these were made with bad permissions by an earlier badly installed SketchUp it can cause issues - there are separate instructions for this in that Extension's thread... you simply delete its prefs folder and SketchUp recreates it with proper permissions.
Installing SketchUp in any other way - e.g. by double-clicking its installer exe file to "Run" it will lead to all kinds of unexpected issues, often centering on bad file permissions and unsaved settings across sessions etc...
Having admin-powers is NOT the same as using "Run as administrator" on the installer's exe file.