Install Abort

[FNU LNU]

i was about to instal debian into one of my laptops and then chose a different 
laptop at the last second...i had already installed my debian cd when i 
realized i was on the wrong laptop...now everytime i turn on my computer the 
first screen that pops up prompts install.....is there a way to kill this 
install or do i have to install the program and then uninstall it??...