Blue screen of death unmountable_boot_volume?

i have an my inspiron 1501 XP Professional if u know about unmountable_boot_volume than you know that safe mode and restore to good condition doesn't work i need to boot it into the desktop so how do i do that i dnt have any cds that came with it so i need download sites then i need to know how to use the cd step by step directions would be best please... its been down for like 7 months ive always fooled with it and looked up how to fix it i but now i need it not the stuff on it but i need it to be functional---please help