ahh. then thats different. if u boot from ur os cd (presuming its windows), u can format the drive(partition) hopefully wen its done that DONT choose to install the os otherwise ull have to a version of windows on 2 hdds
if u put the os cd in ur drive, then restart ur pc, boot from the cd and choose to install windows, choose the 4gb drvie. it will then ask u to format. format it but quit the setup as soon as it has finished. the cd shud allow u to confirm after the formatting and before the installation of windows