Adsl keeps cutting out, ethernet and USB

[cloudye]

Hi, I am running XP family, service pack one (although in add remove, some service pack two stuff is evident also), connecting via ethernet or usb, the internet connection keeps dropping and I have to reinstall the tiscali usb drivers. I have run many tests for virus and trojans etc and assume now that it is OK.
Any ideas as to why the tiscali drivers seem to be knocked out so often and connection lost????

Sometimes it connects for a few hours and then drops, other times a few minutes only.

Many thanks