Just some quick thoughts on your HijackThis log:

1) You need to put HijackThis into it's own folder - it makes backups when you fix something and you want to keep them all in one spot.

2) The following should be fixed:

R3 - Default URLSearchHook is missing

3) It's not wise to have to antiviruses running at the same time (Norton &AVG). Some people view it differently, but IMHO they can interact in less than optimal ways.


As far as your "virus" here are some things to make sure your system is clean:

1) Purge your temp internet files

2) Run your pc through an online scanner like the one at http://www.pandasoftware.com/activescan/

3) Download an anti-trojan. I personally recommend A2 which you can get from http://www.emsisoft.com/en/ .

Then your pc should be assuredly clean.

HTH