By default, Windows 7 does not support Virtual Desktops (or Workspaces) unlike Linux. However, there's a program called Desktops
from Microsoft Sysinternals that provides a similar functionality.
However, I discovered one important limitation: scrolling generally doesn't work on the second (and probably subsequent) desktops.
So far, scrolling works on Firefox, but only because it has a built-in scrolling feature (click middle button, then move Trackpoint up/down, click again to stop scrolling); the usual "middle button press-and-hold" scrolling doesn't work at all.
I haven't done any more tests (like using a mouse), but will get back to it when I have free time.