but pretty much everything you have said on this topic
demonstrates that you do not, in fact, 'know all about this'. There is
a *vast* difference between the physical memory and the virtual memory -
not least of which is the fact that your CPU cannot directly access (and
therefore cannot have active processes running in) the virtual memory
and so the amount you have is irrelevant to any performance issues with
your machine - you could have several exabytes of virtual memory and it
would make no difference whatsoever. All that is important is that you
have 'some' virtual memory.

The *only* figure that is relevant is the physical RAM figure - you have
768MB of RAM in your machine as reported, correctly, by both Ubuntu and
Windows.

As an aside, even if you were right in your assertion that the virtual
RAM counts, you'd still be wrong as physical and virtual RAM are
reported separately and so you would, in fact, have 2.75GB RAM and not
the 2GB you keep claiming.

Having said all that, 768MB should be ample to run *any* modern OS
without problems.