@pino-88
It’s definatley infected. I’ don’t know if you can replace it as you suggested. It may be worth a try. It’s also possible SAS will remove it, if you want to try.
Click on this link for download and set up instructions.
http://forum.avast.com/index.php?topic=32338.msg270447#msg270447
Failing that, we can use a different method.