Ken wanted to install a program, but he doesn't have administrative rights in Windows. Leo says that's a good thing. In fact, this is why he shouldn't have admin rights, because malware could easily be installed if he did. He should try using his user login, which should have admin rights. If it doesn't, he should go to the User Accounts Control Panel and see what's going on there. He'll be able to see all of the accounts on the computer there.
The chat room says that user accounts can get mixed up, and in that case, Ken will have to reinstall Windows. Since it's happened to two of Ken's computers, there may be malware.