My laptop lets me login but it goes onto a black screen for a good 5 minutes

[020407]

My laptop lets me login but it goes onto a black screen for a good 5 minutes, also when I try to get into certain apps such as mcafee it comes up with a message that says you do not have the permissions to get into this app or something along those lines 

[NathanS20]

It appears your user permissions have been changed/corrupted try launch CMD as administrator by searching cmd on start button and right click on cmd to run as administrator and enter this command icacls * /t /q /c /reset to reset all user permissions to their default state.

[NathanS20]

In regards to your first issue can you post a screenshot of your task manager processes, sorting by memory usage like shown below, To enter task manager right click on taskbar and click task manager.