HP Laptop with windows 7, 64 bit, Intel Duo. Have installed Avast 5 free for some time now, have latest updates and all appears to be running ok, Avast says system is secured. But in Windows Security manager it says no Virus software is installed. Are there any changes to do to windows setup so that avast is detected. I had previously uninstalled Norton that came with th Laptop when new, before I installed Avast.