A friend of mine is still using Windows ME and has come across a problem
whereby he can access websites that he has NOT visited before, but some
websites visited recently are now not accessible. From some reason he cannot
access any antivirus sites.

Does anyone have an ideas? Eg a particular virus or picece of malware?

I realise that using ME is not the best of plans for a work pc, but he runs
is own business so updating it is not all that easy.

He is using AVG as his antivirus software.

Cheers