When I start up my computer a small icon appears for about half a second in my system tray, then disappears. It usually appears between my wireless icon and Diskeeper, but it's exact location varies. Since it only flashes up for a moment I cant quite discern what exactly the icon is - It's seems to be a navy blue coloured square, with two white wheels on it. Can you solve the mystery??

START RUN MSCONFIG STARTUP TAB will list programs loaded at startup

If you have Synaptics mouse driver/software installed, it could be one of their tray icons.

Or just right click anywhere AROUND ( not on ) your time in the lower right hand corner, and then choose PROPERTIES, then click on CUSTOMIZE, and it will show all icons that are either in or have been in your systems tray in the past. There will be two lists, one is for CURRENT items, and one is for PAST items. It will also show you whether those items are hidden or not.

Good answer by JohnFL except that if you right click on any part of the Task Bar you will get the properties menu. Stuart

Take a screenshot lol, you may have to time just right though. Truth can become lie, but if lies become truth we're in trouble.