Which Anti-viru should i use ?

I suggest you use AVG ANTI VIRUS FREE EDITION. You can get it from www.grisoft.com. It is very fast and I have using it for the past 5 years and I haven't experienced any virus attacks on my pc. Updates are small so you can easily download them on a daily basis to keep your pc safe from new invasions. I hope this helps.

I use Norton but lately I am finding it doesn't seem to pick up a lot of the newer virus'. I am not sure about the other product so I cannot advise you on that one.