hello everybody! im new in the community and hope to upgrade my own knowledge with your tech articles and enthusiasm to help others. Im not a guru, but i learn fast. I need your inmediate help. i have an old presario r3000 series which is in perfect condition although very slow. i recently added one g to the original 256 mb ram installed. it worked fine the first time after the upgrade, but then windows would'nt start and showed the following message: win cld not strt cause the following file is missing or corrupt: \windows\system32\config\system it then aked to try repair the file using the original setup cd-rom. i never tried repairing the os before. when prompted to choose between repair and setup, i chose the option of repairing, but the list of commands i get when i enter help is mostly unfamiliar to me, attrib, batch, cls, diskpart, listsvc, etc . ive gone through most of them, but i dont know what to do next. i had not backed up my hard disk so i am afraid i will lose everything if i choose to setup xp. can anyone help me repair the os?