Hello and welcome to the forums trivender!
It seems your system can only access 3362 MB of your 6 GBs of RAM because you're running 32bit Windows 7 ... If you'd like to access all your RAM I recommend moving up to Windows 7 64 bit..
It's an inherent architectural limitation that cannot be normally circumvented by any other means...
Hope that helps!
EDIT: Beaten like a horse by Golden