4gb ram installed 1.86 avaible?

Why is this does it mean I can use only 1.86? can i change it?

AMD Athlon II X4 640 3Ghz AM3 CPU
Diablotek DA Series 500w
MSI 760GM-P23 (FX) AMD Series Socket AM3 Motherboard
Crucial Ballistix 4GB KIT (2GBX2) DDR3 1333
Windows Vista 32 bit
Gpu: Sapphire Amd Radeon 7770 ghz oc
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More about installed avaible
  1. Any PC has a certain amount of RAM allocated to the system. Yours seems a little high but unfortunately this can not be changed.

    Although you may see better results if you get a 64-bit Windows 7 system. Vista is horrible.
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