My computer kept telling me something like:
"Your system is low on virtual memory; certain functions will be limited while the computer attempts to expand..."
But, it was never able to get it right, and the system would sometimes crash. So--one in a million shot--I tried to fix it myself. I went to help, typed "virtual memory", followed the directions given, and... problem solved!
I doubled the size of the virtual memory file, and all the problems went away. So, what exactly did I do? Is there any risk in it? Is this a common problem that people might mistake for a virus or something else?
I'm guessing it is not common. It looked like the prior owner had a custom setting, instead of letting the computer pick it. The recommended setting was much higher than what was set.