i tried doing that string , but all it reads is: No such file or directory

when i type in mkdir/ GFXBackup it says no space left on device.

and when i type
mv /System/Library/Extensions/AppleIntelGMAX3100* /GFXBackup it says No such file or directory

so what am i doing wrong. not sure if this is of any importance but i dont have a previous version of mac installed i have vista.

also how comes when i go to install it shows the grey apple icon then the lcd blurs out