I'm going to shortchange and write the short answer. This is fine with 32 bit versions of Windows. It's widely discussed so I'll stop here.
i have an acer aspire 5740G
though i have 4 gb ram,
and 3 .86 gb usable
it shows that 2.73 of physical memory is available and the rest 1 gb is virtual memory.
what does it mean?? how to increase the physical memory?? does it have any effect.(pros and cons).