Installed Memory (RAM): 12.00gb (3.25gb usable)

up4it136

Honorable
Nov 6, 2013
6
0
10,510

it got 32 bit

 
I doubt you do have a 64 bit os.
Since when using a 32 bit os with 4Gb of memory it also reports 3.25Gb
usable.

So I would double check you do indeed have a 64 bit version of windows installed.

If you have go into the bios and have a look for an option that says memory remapping mode. If it is turned off, turn it on.
Save the settings before exiting the bios and then use windows system info to verify 12Gb of memory is populated.
 
If the OS came with your computer, the license only covers 32-Bit.

However if you bought a DVD of the OS, then there should be 2 versions, one 32 and one 64.

If you don't have a DVD, you will have to purchase one.

Be sure to backup your data before re-installing it, because it will erase everything.