I'm putting this in the Lounge because it is not about Macs.

A friend of mine, on a PC, is experiencing the following. I write to him at yahoo. He logs in to Yahoo, can see my emails awaiting complete with subject line.

When he clicks on the email in his in-box, his PC locks up completely. He has to reboot and there is still no access to emails sent to him on the Yahoo account.

This only happens with Yahoo. It happens not with any other email provider nor any other website.

So, friendly people, what's happening here, do you think? I suggested some firewall problem but he said nothing had changed at his end in the last few weeks. I suggested deleting cookies and he says he'll try that, but it seems a long shot. This only happens with Yahoo and I've had a good rummage around there today but no-one else reports this particular problem, only Yahoo running slowly, intermittently.

I think it's his PC, somehow.......but I'm not sure either.

Ideas? Thanks in advance.