That isn't very specific. You could mean that it was running super slow, or you could mean you threw your computer on a fire. If you still have your old computer then you should see if the hard drive uses the same connectors as your new computer then you could easily plug it in. If your new computer uses SATA and your old one uses IDE then it's a bit more complex because you'd need a converter. Then again, is your old computer even working at all or not? If it works see if you can at least get on with safe mode (hold F8 when starting the computer up then select safe mode) if the hard drive is messed up then you might have some luck with a program called recuva which worked well for me once. In future, back up your files with something like Dropbox.
there is no easy way ??? !! my old one can't even be open