But the point is, that it was happening with my internal modem and now it's happened with my external.

I THINK I have it sorted.

I deleted all my TCP/IP protocols and started again setting them up.

I had too many, namely a few set aside for PGP VPN Adaptors and such, and now they've gone it seems to work fine.

I even added in IPX support too, for the heck of it.