Viruses won't go away

[kimchi]

I've been using AVG free edition for a few years with no problems. However, over the last month or so I am constantly getting messages that I have a virus.

They 'heal' OK, but I just have to heal a virus every couple of minutes.

I run updates and C: drive sweep every day and AVG picks up around 40 viruses every day (and deletes/cleans them). After the daily virus check, AVG just keeps picking up more. While nothing malicious seems to have happened (yet) running online accounts & banking from my laptop is worrying.

I have XP sp2 fwiw. While typing this, 5 virus messages popped up and I healed them.

The most recent cretin that won't go away despite being "deleted" 100+ times EVERY DAY: -

Trojan Horse Downloader Generic 8.NDA

Sorry for being a noob and thanks for any help.

EDIT: It's appeared 8 times while posting [img]/images/graemlins/frown.gif[/img]