about the project file that i downloaded from your webste

[nikulpanchal]

i am unable to understand how to open this all file that i downloaded from your website  how to run hardware simulator when i click on it a black window of cmd runs and goes away i am presently using windows 7 bit'

[cadet1620]

Do you have java installed?  Run "cmd" from the start menu and then type "java -version".  If it says "command 'java' not found" you need to install java.

If you are running 64-bit Windows, you need to have the 32-bit java installed for Nand2Tetris.  The java installer just installs the 64-bit version by default.  You need to manually install the 32-bit version.

If you have Java installed and the Hardware Simulator is failing, type "HardwareSimulator.bat" on the command line and post the error message it's printing.

--Mark