You already have a bootable CD, so requesting one by post won't help. What you need to do is change the settings in you BIOS to allow you to boot from CD.
How you do this will vary according to your motherboard and BIOS manufacturer. Typically, you press F1, F2, Esc or Delete at boot time: Most PCs will show a message "Press F1 to enter Setup" (or similar).
Once you are in the BIOS setup routine, you should find a menu called "Boot Options" or similar.
Typically you will set the Boot Order to be CD as the first device, and HDD as the second. You may also need to "Enable boot from other devices"
Then save the options.
Once you have done this, the computer will boot normally if there is no CD in the drive, but will give you the option to boot from CD if there is one in the drive when you turn the machine on.
As long as you are using the the Ubuntu Live CD option (i.e. running Ubuntu from the CD without installing it) there is no danger of doing any harm. The mistake topogigo made was in installing it, without fully understanding.
As for the video settings, these can be changed in much the same way as they are changed for Windows, but you may need to install a proprietary driver for your video card.