Should i purchase an antivirus or download one from the internet?

I tired Avast! but it didn't work

Should i purchase an antivirus or download one from the internet?norton internet security 2008

It depends if you want good protection, if you do get NOD32 or Kaspersky (they're the best). If you want a free anti-virus I recommend in this order (install only one):

1. AVG Free

a. A simple interface (easier to use than Avast! and Avira)

b. Can detect about 82.82% of viruses

Cons: low virus detection

2. Avast!

a. Real-time protection

b. It has an option to delete a virus once found

c. Can detect about 87.46% of viruses.

Cons: Too many icons and confusing user interface

3. Avira AntiVir

a. It can detect malware better than Avast and AVG

b. It's cute umbrella icon

c. Can detect about 94.26% of viruses

Cons: A very sluggish update

Should i purchase an antivirus or download one from the internet?spyware removal

Avast and AVG are terrible

Buy Kaspersky!!!
Purchase to get a CD.
protonic.com has a boatload of free downloads that have been tech tested and approved. Check them out!!!
I highly recommend purchasing a copy of a reliable vendors product (like Mcafee) from your local PC store (like Fry's).