its usually one of the function keys for example pressing F8 on bootup for a windows based system usually kicks you into a boot menu allowing you to go into safe mode, sometimes l have found keys like F9 or F12 sometimes kicks you into the restore mode but on other occasions there are other keys or a combination of keys.. which is why l suggested looking up the make/model of your laptop and which keys to press as its very unusual for a laptop to not have a restore sector to return to factory default, especially since from what l have read that you use Vista.
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