hi im having lots of problems with my laptop
i LENT it to my mum for a few months but INSTEAD of just creating a new account for herself she managed to put another operating system on it so there's 2 computers on it now. she's put a password on it and doesnt remember it. (she doesnt know how to use computers so im guessing she got SOMEONE else to do it for her).
i think i may have deleted something important off my part of the computer (system32???) because now its just giving me blue screen ive run all the tests and done everything i can but cant get into my bit of the computer.
ive been trying to do system restore but it wont EVEN let me get that far on my bit. i tried to do system restore on her bit but because of the password i cant. would system restore even work? would it just restore one part or would it do both?
im very confused, not very good with computers but have tried all the options like starting in safe mode. also the laptop is very full i think there's less than 10g on it.
sorry if this doesnt make much sense as i said im not very good with computers and have used up all my limited knowledge!
any help would be much appreciated!What is the make and model of the machine? Did it come with any CDs?

it is DELL vostro 1000..
ive lost all the discs, moved house about 3 times since i bought it. A friend offered me a windows 7 disc but i really dont want to lose all my stuff..