my laptop is goin really slow and i dont know why. i downloaded my favorite game world of warcarft and it was fine but now everthing on my laptop including world of warcarft is goin realy slow

Did you install many more things after you downloaded the game and before the game had gotten slow?
Sometimes games take a tremendous amount of resources from the computer, and anything else that can be running in the background such as anti-virus software can really bog the system down. If you game crashes to the desktop, this can be a sign that other programs are running and taking up to much of your resources. If you game plays fine, and then slows down after a few hours, and only a reboot will speed it up, than this can be a lack of RAM. I would suggest that you start by turning down the frame rates, and details on the game and see if this helps. Generally, games have the options to do this from the main menu. If this doesn't work, I would suggest that you turn programs off that aren't needing to continually run on the computer.