After running well for a few weeks the spinning blue circle is back. In the middle of working on the computer, Firefox greys out and I get the spinning blue circle. Or, Outlook crashes and I get the spinning blue circle. It's frustrating.
It seems that there is something running in the background that is hogging resources, but I can't imagine what it can be. (It may be something else, of course.)
Note that while typing the above sentence and this sentence the computer locked up two or three times for three or four seconds.
I've got Carbonite installed, but I have it paused. I've got Norton but it is not running anything special.
Also, tonight, the screen blacked out for a while and I could not rouse it. Meanwhile, the songs on iTunes kept playing.
What should I do?
Is it worth it to buy PCmatic or one of those advertised programs?