If it's telling you that you're out of memory (RAM) then you may need to add some. Memory is not the same thing as disk space.
I could be wrong here, most probably I am, but I thought that RAM was not used up as is disk space. In other words, it (that original quantity) is always available to work programmes. For instance, this computer lists RAM as 512 MB.
If that is always available at any given moment, then why should it suddenly stop being enough to power the same stuff that I have been using for a couple of years? As always, I find the world of computers very opaque indeed! Just when I get something to work, steadily and reliably, something always ends up throwing a spanner into the works, as now.
Am I wrong in the above assumptions about the availability of RAM? I imagined that it was when the memory was full that problems arose.
Thanks for your help,