I downloaded 'internet installation boot image' from http://download.opensuse.org , and burnt the image on a CD. Then I inserted the CD and restarted my computer. The comp. was unable to boot from the CD. what should i do? how can i install suse ? please help.

I'm surprised nobody replied so far.

Usually if the computer does not boot from the CD, is because you either did not configure the computer to boot from a CD before the hard drive through the systems bios/cmos. This is done via "setup", most cases to access setup you will get directions early in the boot process as to what key on the keyboard to hit to enter setup. If you do not see such a message, try any of these combinations when the first "splash" shows up on the monitor:

Hit F10
Hit F1
For a Dell, hit F2
Some older models, hit the Delete key
Compaqs, you may need burn and use a "Recovery tools CD" or access setup from Compaq resources or similar from main menu in Windows.

Once in the system setup follow instructions at the bottom of the screen to navigate to "Boot or boot sequence or similar", and if there are three positions, highlight the first one and change it to 3.5" floppy, change the second one to IDE CD rom, and the third should be HDD or HD0 signifying first drive. This way the computer looks at the floppy drive first, then the CD drive, then the hard drive for something bootable. To exit setup, normally you need to hit "Esc" key, but instructions should be at the bottom of the window. For a dell, after hitting F2, scroll down to "USB or CDROM device" and hit enter.
Second, maybe the CD you made might not be bootable because it was not burned properly, using a burning software suite like Nero or Roxio, you must find the link to "burn CD image" or "burn from CD image" or similar to have it include the /boot sector on the disc which is in the image, if a person just burns the suse.img file onto a data disc, it will not boot.

thanks junior hacker.
the first one may not be the case as I had selected the option 'boot from cd' . may be that disc was not burnt as a 'bootable disc' . i will try burning the disc again.
thanks a lot.

When you put the disc you made in the drive within Windows, and browse the disc, if you see one file called suse.iso or whatever, means it was not done right. When you browse a disc made correctly you should see many files and folders just like what would appear if you browsed a Windows disc. If you do see many files and folders, means your drive has problems reading a burnt disc or the disc is to cheap, or the burner did not do a good job, dirty or to old.