Since the troubles with Norton I am now using BT Internet Security Pack.
After getting rid of norton I then went to my account page on BT Broardband Office and found that they also do an Internet security pack. So I down loaded and ran . It found many spyware & 1 Virus on the PC,after Norton had said that there was no trouble. Since then all is well, No virus or spyware getting through. Well done BT.