Actually, not necessarily. Windows has the Virtual Store functionality, which a user to "overlay" a folder from inside his own home directory into c:\program files . While I don't believe it's how Steam operates, it is how a series of other software uses "c:\program files" without admin access, in a user-specific way. See https://stackoverflow.com/ques... for details.

Ghostery, probably because it keeps you private while, guess what?, selling your data... https://www.ghostery.com/faqs/...