Why can I only use 2.48 GB RAM in Boot Camp (Win 8.1 Pro, 64-bit)?

Hello, I am fairly new to the iMac and I have to use some programs in Windows that are not available for Mac so I set up Boot Camp and installed Windows 8.1.
My iMac is a I7-2600 CPU @ 3.4GHz with 16 GB RAM, system type-bit. Under system in Windows it shows Installed memory (RAM) 16 GB (2.48 GB usable).
I read about this problem and most answers are related to people using 32-bit. So what is wrong in my case, where is the problem?
Thank you in advance for help and suggestions.

Can you check msconfig in Windows as shown in the linked discussion?
You may also want to look at https://msdn.microsoft.com/en-us/library/windows/desktop/aa366796%28v=vs.85%29.a spx?f=255&MSPPError=-2147217396.
What is the year/model of your iMac (my guess is a 2011 iMac)? Can you post the output of the highlighted command from OS X Terminal?
sysctl hw.cpu64bit_capable
hw.cpu64bit_capable: 1

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Typing the body of the thread message in the title, huh? -)
I am working on a MacBook Pro (13-inch, Mid 2009) with boot camp running Windows 7 pro 64-bit. Windows crashes quite often now-a-days and I need to get this fixed. I heard that updating boot camp can help. Currently I am running Version 3.0.4 (322).
Only Apple could hamstring and tie Mac OS to Windows. There isn't any other than whether you can download the drivers into Windows (you can) but Apple puts a block on the installer setup even if your mac does not support it.
Windows 7 needs at least Boot Camp 3.1 and 3.3 is what you should already have. And you are not getting security updates if you don't have at least 10.6.8 as was pointed out. --- you arent using Software Update as you should. And you should backup and clone Mac (and Windows) as well.
You need Mountain Lion to use Boot Camp 5.x which supports Windows 7 & 8 and 64-bit.
I would upgrade to Lion if you can realizing that Rosetta and PowerPC are no longer supported though.
Mac 101: Using Windows on your Mac via Boot Camp
https://support.apple.com/kb/HT1461
http://www.apple.com/support/bootcamp/
Helpful Apple Support Resources (Forum Overview)
Boot Camp Support
Boot Camp Manuals
Boot Camp 5.0 Drivers
http://support.apple.com/kb/DL1638
Frequently asked question
http://support.apple.com/kb/HT4818
http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.7.pdf
http://manuals.info.apple.com/en/Boot_Camp_Install-Setup_10.6.pdf
http://manuals.info.apple.com/en/Boot_Camp_Install-Setup_10.6.pdfcreate a Windows support software (drivers) CD or USB storage media
http://support.apple.com/kb/HT4407
The Boot Camp Assistant can burn Boot Camp software (drivers) to a DVD or copy it to a USB storage device, such as a flash drive or hard drive. These are the only media you can use to install Boot Camp software.
https://support.apple.com/kb/HT4569
http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.8.pdf
Instructions for all features and settings.
Boot Camp 4.0 FAQ Get answers to commonly asked Boot Camp questions.
Windows 7 FAQ Answers to commonly asked Windows 7 questions.
http://www.apple.com/support/bootcamp/
Is there a download of the Boot Camp 5 Support Software if I'm not using OS X Mountain Lion v10.8.3?
Yes, you can download the Boot Camp 5 Support Software here.
http://support.apple.com/kb/DL1638
How do I use the Boot Camp 5 Support Software I downloaded from the web page?
The download file is a .zip file. Double click it to uncompress it.
Double-click the Boot Camp disk image.
Copy the Boot Camp and "$WinPEDriver$" folders to the root level of a USB flash drive or hard drive that is formatted with the FAT file system (see question below for steps on how to format).
Install Windows, leaving the flash or hard drive attached to the USB port of your Mac.
Installation of the drivers can take a few minutes. Don't interrupt the installation process. A completion dialog box will appear when everything is installed. Click Finish when the dialog appears.
When your system restarts your Windows 8 installation is done.
Note: If the flash drive or hard drive was not attached when you installed Windows and was inserted after restarting into Windows 8, double-click the Boot Camp folder, then locate and double click the "setup.exe" file to start the installation of the Boot Camp 5 Support Software.
How do I format USB media to the FAT file system?
Use Disk Utility to format a disk to use with a Windows computer. Here's how:
Important: Formatting a disk erases all the files on it. Copy any files you want to save to another disk before formatting the disk.
Open Disk Utility.
Select the disk you want to format for use with Windows computers.
Click Erase, and choose one of the following from the Format pop-up menu:
If the size of the disk is 32 GB or less, choose MS-DOS (FAT).
If the size of the disk is over 32 GB, choose ExFAT.
Type a name for the disk. The maximum length is 11 characters.
Click the Erase button and then click Erase again.
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64-bit versions of Windows 8 and Windows 7 are supported using the Boot Camp 5 Support Software. If you need to use a 32-bit version, you need to use Boot Camp 4 Support Software, and you must use Windows 7. 32-bit versions of Windows 8 are not supported via Boot Camp. For a complete list of Windows OS support, click here.

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You can give feed back to Apple from the iTunes drop-down menu in the iTunes menu bar..
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Hi,
Firstly I'd like to clarify myself: I'm not working for any hardware and software vendor. I've posted few times: they (all of them) don't sell printers, they sell inks because in many cases total cost of a new set of inks is more expensive than a new printer with inks (I know cartridges are not full). Since inks are very expensive, many people use chip resetters, continuous inks systems .... to reduce printing cost such as some thing like one of this.
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**Click the KUDOS thumb up on the left to say 'Thanks'**
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