HELP PLEASE I NEED MY COMPUTER BACK :'(?

some weird thingy ma jig keeps popping on my computer screen and need help to get rid of it. i have a recovery cd, bi dont know how to use that either and no matteif i click cancel, or try again or X out of it, it keeps popping up !!! help !!!! (it keeps saying this : there is no disk in the drive. please insert a disk into drive \Device\Harddisk1\DR3)