my acer aspire one says windows cant be installed at this time after retsore
how can I fix that my self .it has no disc drive .
You will need to make a USB installer tool. Take a look HERE for the tool and directions on how to make the installer USB. If you don't have a Windows DVD you can download the exact same version that was installed on your computer (take a look at the Windows sticker on your laptop) from HERE and use your activation key from the laptop sticker to re-activate.