definately the fact your screen is vga is your problem.
Definition of VGA - Abbreviation of video graphics array, a graphics display system for PCs developed by IBM. VGA has become one of the de facto standards for PCs. In text mode, VGA systems provide a resolution of 720 by 400 pixels. In graphics mode, the resolution is either 640 by 480 (with 16 colors) or 320 by 200 (with 256 colors).
Basically get a new monitor.a second hand one can be had for as little as £20 with patience and a look on google.
alternately try for a quicker solution
click here - easy to use
click here - dirt cheap
click here - refurbs
click here - I bought my computer and another from these people, and are selling with 3months warranty 17" monitors for £35. very good service and friendly aftersales also.