How can i stop a software to install on my computer?

my sister keep installing profusely of software on my computer, i only wannna stop her from messing around..

can anyone aid?

Answers: Have you tried creating separate users? This bearing, you or her requirements to login to your own user article. But that wont prevent her from installing stuff on her description, ud enjoy to monitor that urself or update her not to.

If your unsure roughly whats individual installed, do weekly virus scan.