Ive lost my anti virus?

hello all i tried to update my norton antivirus supplied by bt but it has completely dissappeared from my pc ive looked in add or remove programmes and searched everywhere ive tried re installing it but it says i have to get rid of 2006 version first any help would be helpful

Ive lost my anti virus?computer

Forget Norton. If you want a free anti-virus I recommend in order of popularity, but please choose the right one for you (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

Ive lost my anti virus?free spyware

Well rid of it - caused me nothing but problems and a mighty slow PC.

Totally agree with Samuel Adams.
Uninstall your Norton through your add/remove programs, then run the Norton Removal Tool to finish the removal job: