Any idea why this error happens?
How much memory do i need? I have 8 RAM.
Follow the instruction of the author in first page
TROUBLESHOOTING
For most cases miner shows detailed error messages with explanations. To achieve maximal mining speed, start miner with admin rights once (miner must show "scfg: 1"),
it will configure system for optimal performance; then reboot computer to apply changes. For normal work no admin rights or other permissions are required. However,
if you use Windows UAC and start miner as admin in non-elevated mode miner will not work. Either create normal user and start miner there, or disable UAC.
Miner must show "FAST MODE ENABLED" message if everything is ok.
Sometimes reboot is necessary to clean RAM, otherwise miner can show "not enough memory" error.
Low speed in Windows 8.1 x64:
1. Make sure you are logged as admin. Create shortcut for NsCpuCNMiner64.exe on desktop.
2. Open shortcut properties, and specify command line parameters, for example:
C:\miner\NsCpuCNMiner64.exe -o stratum+tcp://mine.moneropool.org:80 -u 449TGay4WWJPwsXrWZfkMoPtDbJp8xoSzFuyjRt3iaM4bRHdzw4qoDu26FdcGx67BMDS1r2bnp7f5hF 6xdPWWrD3Q3Wf7G6 -p x
3. Press "Advanced" button, check "Run As Administrator". Also disable UAC and reboot (perhaps this step is not ncessary for your configuration).
4. Start shortcut, I get about 290 h/s on stock i7-4770 in Windows 8.1 x64.