I am using tesco.net on a windows xp sp1 computer. Recently the internet has been disconnected straight after connecting (about every 2 in 10 attempts), but won't reconnect. A new connection appears called 'x' which tries to connect.
I've scanned with norton antivirus, spybot S&D and ad-aware, which all say no infection (which is odd as there are usually spybots of some kind).
Is it a glitch or malicious? Any suggestions how to fix it
CCleaner is a bit of a long shot. Delete the rogue connection and then immediately run Issues in CCleaner. It deletes, amongst other things, 'leftovers' from un-installed items. You may safely delete everything it finds.
It will also be worth disabling System Restore then running a full scan (AV, malware, etc) with all the scanners you've got (update them first). Don't forget to re-enable Sys Restore when you've finished scanning. Note, however, that by disabling Sys Restore you will lose all your restore points.
By disabling Sys Restore first your scanners should find any rogue elements which are caught in memory between restore points.