virtualbox.org

Running windows 7 64bit home premium SP1 4GB ram and 1 GB graphic ram on a Nvidia GT300M
I installed the latest release of VirtualBox and tried to install Android 4.02 in a new machine
I did not like the results so I removed the android machine and uninstalled the Virtual box
Now I have lost about 1 GB of my ram and 512MBs of my graphic ram
how may I solve this

RAM is part of the hardware spec of the PC. VirtualBox is just an application. You can't lose hardware because you installed any application.

Applications need RAM to run. They consume no RAM when not running. You will however have less available disk space until you fully delete the installed files and VMs. The location of VirtualBox files is given in the user manual.

I suggest that you find a friend who knows more about these things than you do, and get that person to help you better understand your problem.