If you are NOT a member of the Administrators group (on your computer,) you will need to log in to an Administrator account. See instructions (if there is no Administrator account on the login screen):
[url]http://forums.sketchup.com/t/windows-10-installation-problem/14436/4[/url]
If you are already in the Administrators group, then once logged in, see:
Installing SketchUp: http://help.sketchup.com/en/article/56085
ie, run the installer by right-clicking and choose “Run as administrator”.