I think I need to reinstall manually through command prompt, can anyone tell me how to do this? Or do they have any additional advice? I don't have a Windows 7 disc (I've seen the 'creating a bootable USB installer' videos etc, but these seem to require a disc with windows on from which the USB is made, which I don't have!) Hence I think I need to go through command prompt. Through the 'recovery' option on 'Assist' button/function) I must access it as an administrator. I cannot remember my administrator password which in itself has caused many problems to get around this, I think I need to re-install windows - but to do this as a function on the computer (i.e. Hi there, I have a Sony Viao which does not have a disc drive and came with Windows 7 ready installed (installation was done automatically along side the process of starting computer up for first time after purchase).