Try the usual and create a new user account. Make it an Administrator. How to create accounts is on the web so I don't write how here.
Test in the new user account and next time tell more.
every time i go and open an app on my pc , it kinda freezes and then is show's me an error sayin i dont have access to it .then i try once more but when i go back at the app its gone.What can i do for that.Please help me!