It is o.k.
how did you install the system? did you do a wubi installation?
I am just feeling bad because you came to linux just to find yourself in trouble. however what you need to do is put the cd back in the computer and re start the computer with the cd in.
Then select try Ubuntu without installing (Because I am assuming you had already install it, right?) then when the system is all loaded make sure you have internet connection too so check the wireless or plug a wire in the computer then here we go:
Note this solution is for a installation done using a tool in the ubuntu cd called WUBI (Windows Base Ubuntu Installation)
press the key alt and also f2 at the same time, in that pop up you have there type terminal and press enter.
in the terminal you will type the following code first type (copy it from here)
sudo mount /dev/sdXY /mnt
press enter and
sudo grub-install --root-directory=/mnt /dev/sdX
press enter and you are done. Play with Ubuntu a little bit if you want from the CD or
reboot your computer remember to remove the CD from the CD tray so the PC will look for the harddrive
Good luck and let us know how you did.
Anyway I think GRUB stand for GRand Unified Bootloader, and that is the little program that help your computer boot from different operating systems, MAC has a similar program call it BootCamp and windows has also its own winloader I dont remember what its name though
Note: Here is the link to the ubuntu guide. read it when you find time and when you are wondering how to do something in your brand new Operatin System