Actually though I did restart. I left it on overnight to download something the next morning everything had errored, so I switched off the computer and went to work. When I put it back on later that night, it had no net access for about 15 minutes (was busy cooking dinner at the same time). Posted this thread, went back to cooking, then noticed it was back on, cursed it, and um, now I'm here.
Oh also, I started running a virus scan (no result) and midway through net access started.
Was a bit concerned that something was up because the net went down on the weekend at some point, which is quite unusual for me these days, and for one reason or another I suspected that there was a connection (or none as the case may be).
There, that is all the info that I bet you didn't wanna know regarding this subject!