Pc doens't start up again

Hello Linda. I apologize for the inconvenience caused. I kindly request you to have a look at this article http://avgread.me/1PRjWyU to restore the changes made by the AVG PC TuneUp program. Thank you.

I have the free trial version AVG pc tune up gedownload and after I had to start up my pc. 
but after that he wil not start again and I couldn't turn him of so a put the battery out the pc 
and put it back in. Now he begins to start but after a few seconds it stays black screen, windows wil not start up
Can you help me what is the problem

De Backer L. Belgium

Hello Linda. I apologize for the inconvenience caused. I kindly request you to have a look at this article http://avgread.me/1PRjWyU to restore the changes made by the AVG PC TuneUp program. Thank you.