1) Check the service pack version on your computer. If it is not updated to service pack 3, please do so.
2) You will be able to get these downloads on the Microsoft website, www.support.microsoft.com and in the search type service pack 3 and the windows version you are using.
3) Next check for the BIOS version on your system.
4) If the latest version is not on your computer, please upgrade to the latest version available.
5) Next, if you still have problems seeing the complete capacity of the hard drive, then you might want to check the Intel accelerator program. If it is not on the computer you may download it from the Intel website. www.intel.com/support/chipsets/iaa/
6) This should allow you to see the complete drive capacity and make full use of it.