problem with restarting window xp

I have window xp installed, and for some reason, I decided to install it again, but then I changed my mind after window xp automatically restarted my computer to start the installation. The problem I have now is whenever I restart the computer, it gave me a choice of Window XP home edition (regular start up) or try to install the xp again. And if I don’t move the cursor within 5 seconds, it goes into window xp installation automatically. Can someone please teach me how to get rid of this?