If you have another computer with which you can burn a DVD then you can create a new W7 DVD.
Get 32-bit English W7 w/ SP1
HERE. If you have Home starter or Home Basic then you will have to download Home Premium and modify the ISO before you burn it; that is a little more complicated but is the only way I know to get starter or home. Instructions to make a multi-version DVD are
HERE. (Since it is a netbook I assume it is 32-bit)
Once you have this W7 DVD then boot your Toshiba with it and do a System Repair.