Thanks everybody for your help,dont know if it shows but Im new to computing so do welcome solid advice.
The feeling I get is that Avast needs a Buddy in the form of another Firewall,and not the Windows one...
Ive put Commodo on,once its learned your Software,it just keeps quiet...You sort of allow it to do stuff,and as long as its somthing I recognise,I allow it.
Id just like to say how helpful this Forum is,absolutely brilliant and Ive reccomended it to fellow new PC users who Ive reccomended Avast to.
I love that voice on a morning to tell me its updated,sort of gives you a reassuring hug,LOL...