Dan White, Edmonton - Query regarding anti virus

Hi everybody, I am Dan White from Edmonton. I am new to this community. I use a dell laptop. The operating system I use is Windows XP and the anti virus I use is Norton. Although norton is working and protecting against viruses very well yet I am facing problem of Laptop hanging. Most of the times my Laptop gets hanged and my work get interrupted. So I have to restart my laptop again and again. Can anyone tell me the issue behind this problem and solution of the problem as well. I am waiting for reply.

Thanks

Dan White, Edmonton