Thanks for the advice. I'm also french, with the same config (Ashampoo, Winxp)...and the same problem, just after the last Avast update. So I was glad to try it, and it worked...well, until this morning when I had to disable once again the webshield, disconnect and connect my modem and enable the webshield.
It seems to be just a temporary fix, but I think it could be solved more definitely with a future update, don't you think ?
I've been enjoying Avast for four years, well exactly one year for my old PC - then I switched to Mac and bye bye viruses and trojan ! - and three on my mother's computer, from where I'm writing just now, which is at least once a year infected by a root kit or another worm, even with avast ... But I'm thanking you even because I know without your software it'll be worse.
But her next computer will be a Mac !