Now, this is quite embarassing as I've asked about this before, but I can't find the thread!
Anyway, I still have this problem that every so often, my screen freezes for a second, then my desktop (only my desktop) goes blank for about three seconds, then comes back up, but with some of the system tray icons missing, although the programs themselves. i.e. firewall, anti-virus etc are still running. This seems to happen when I'm navigating Windows Explorer, i.e. finding files etc, but I can't tie it down to any particular event. The only thing I thought was am I going to quick for it, but surely that's just silly.
First I thought it was my firewall, as it seemed to do it at roughly the same random intervals as you get alerts. It also seemed to start when I 'silenced' the alerts, but I've re-installed the firewall, had the alerts on and off, and I don't now think it's connected.
Then I thought it might be my graphics card drivers, so I updated them, and thought it was OK, but after a while it started again.
This only started happening since I re-formatted my hard drive and re-installed Windows XP, due to a quagmire of other problems. I'm not prepared to re-format yet again, just on the offchance that it might cure this problem (well, it's more of an annoyance really), unless I can actually pin the cause down. I'm wondering if it's something to do with clearing memory, but really haven't a clue.
Any thoughts on this appreciated.