I contend that the NSA spies on us by copying everything we do with our computers to a secret area on the hard drive ("Windows reserved area," the contents of which are never divulged to us), and uploading it to their servers at their convenience. I suspect that the following message, which has been appearing on my computer's screen a few times a day for several years, is a cynical hint of this process:
Your system is low on virtual memory. Windows is increasing the size of your virtual memory paging file....
The main problem with this is that I'm not using anything near the capacity of my main memory (I have nearly a GB of main memory, and I'm running the Chrome browser and Wordpad), so there is no need to use virtual memory.
[For those who aren't familiar with virtual memory, it's an area on the hard drive which serves as an extension of the main memory. When the main memory gets too full, some of its contents are moved to virtual memory, so that the task which the computer is currently executing can remain entirely in the main memory, for best performance. Now that main memory is getting so abundant, especially with HP's memristor-based memory on the horizon, this is becoming less important except in applications which consume colossal amounts of memory. But then the NSA would just use a piece of nonvolatile main memory for their spying.]
I don't know if there's any solution to such spying. After all, wouldn't it be a failure for a spy agency to allow for a convenient mode of communication that is beyond its reach? So, wouldn't such a capability for spying be built into any operating system which we're allowed to have? Unfortunately, this spy agency is run by the enemy of mankind. The solution to that is to decapitate the snake with Glass Steagall.