Because a corrupted profile can occur, make sure you have at least TWO login accounts which have administrator rights. Since you haven't indicated that you are currently using an admin account, be sure that you're using an account with admin rights. Go to the Control Panel-User Accounts and make sure your account is an administrator. Once that's done, then create a new one by clicking on the "Manage another account", then select the "Add a new user in PC Settings".

If you're not logged in as a user with admin rights, then please do so, if you can.

Once the second admin user is created, if your current user login doesn't work as expected, you can always log in to the second admin user and try installing items there.

Hope this helps.

Grif