I will make an assumption... this is running 32-bit Windows. If that is a correct assumption it won't be able to see all 4GB RAM. So that can explain the total 3GB physical memory. Available implies there's 1GB of that available - the rest is being used.
Bear in mind Windows 32-bit operating systems only have 2GB memory space available for user space. The rest is kernel space and for the operating system.
Having said that, why have you got close to 6GB VM?
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