An access violation can be a permission issues - you are not permitted to access certain folders/places on your hard drive, because you do not have administrator privileges on your pc
or
It can be an attempt to access memory outside the allocated memory for the program
In the second case there is no easy solution, in most cases the program will probably also try to shut down
In the first case, you need to reset your folder permission so that you can access the folders - the vid that soulghost links takes you through the process undr vista and 7 (similar for 8 and xp too)