Eddy
2
Did you completely remove NAV using the uninstall util from the Symantec website before installing Avast?
If not, that could be your problem.
And why not trying to solve the problem? Immediatly walking away is the easy way out, but not the best. You can learn from trying to solve a problem 
is there anybody else that has experienced the same problem as i had
How can a question like that be answered if you can't tell us the exact problem?