I have very mixed feelings. Just after I last posted I set off to do something else, and my laptop started lagging to the point of being unuseable. never had any problems with either this or my last laptop in this regard, though did have some other issues with the old one. It couldn't even keep up with my typing. So I just restarted - don't panic, right. Then it took 4 minutes to boot (normally 30 seconds), then everything was laggy for another 10 minutes. I was about to look at doing a system restore and had gone off to get my backup drive to get my work stuff on just in case, when it suddenly started working normally again. Nothing in Task Manager was showing as hogging the resources, there was really no explanation. It's a fast machine and this is the first time I've noticed any lag at all, let alone serious lag, eg excel taking a minute to open instead of 2 seconds. As quick as it happened, it seems to have improved. All I can think of is some large update in the background. So I've gone from mild panic to relief, but also feeling cautious as I don't know what caused it. Just posting this before I reboot and see what happens.