Windows 7 boot failure

have an acer aspire one d257 netbook running windows 7 home starter.
i had set boot password,hdd password and supervisor password from bios and as soon as i pressed F10 (save & exit) it showed that windows needs some start up repair. now the start up repair is going on and on and thre computer restarts finally it asked for sending problem to microsoft to which i clicked no.now the boot screen shows up and after that it shows windows is loading files and then it shows attempting system repair but the it restarts again and the whole process is repeated (it has happened for more than 5-6 times) .Is there a way i can do system restore (i neither have a dvd drive nor i have a windows dvd-the os came pre installed) ? or any other solution pls help

Have you removed all the password requirements from the bios?