|1. there may be a problem with your memory, hard disk, or CD-ROM|
2. or the there may be a problem with the CD disk or the kind of windows you are using
look in front of you machine the kind of windows suitable for the machine is pasted there use that windows ( thous windows vista, XP, 7 etc)
if it thous not work, change the memory, if that does not work fix the old memory and change the hard disk, if that too thous not work put in back and then change the CD-ROM.
an i hope one will work.