Virus Protection

Hello,

 

I am running Norton 360 on Windows7 Professional.I  have had a problem with strange behaviour on my PC,for instance if I key a number into  spreadsheet the number repeats itself continuously and other items just flash on then off if  I try to  open a file for instrance. I did a system restore and the problem appeared to be solved but when I opened the computer again the problem was back.  I did a complete security scan but at the end came up with a message saying that auto protect was not working but the fix button would not solve the problem, auto protect was ticked as being on but was not working. Can any one help please?

Thanks,

 

Paul Saunders