Please don't use this sort of language when writing:
if any 1 can help me u can add me
b coz iz 1rrit4t1ng 2 red & undrst4nd eezily.
If you want to install Ubuntu so that it is the only operating system on your computer (i.e. Vista and any other operating systems will be deleted during the setup; note: this removes any data on the harddisk, including your personal files
), this one is an easy task. After you have burned the Ubuntu disc (the Ubuntu Desktop edition is the combined installation and live cd; the other option is Alternate Install disc which is not a live-cd, but a text-mode installation media), put the disc into your cd drive and reboot your computer (so that the disc is in the drive when your computer starts up). If your BIOS is configured to boot off cd before harddisk, you should get an Ubuntu Linux bootup menu in a moment - if you instead get back to Windows, reboot (again) and right after the system starts, you should see a "press <some key name here> to select boot device"; press the key mentioned and select to boot from your cd drive (or dvd, or whatever optical drive it is that you put the Ubuntu disc into). If you don't see that message, then after you have rebooted press DEL or F12 or whatever key you are told to press to enter setup (=BIOS configuration) - from there change boot device order so that cd (/dvd/other optical drive) is before harddisk, not vice versa, then save, exit and you should be fine.
Once the Ubuntu boot menu comes up, select the option to test the disc for defects (I don't remember the exact words, but it's a selection that lets you have the disc checked for being written correctly). When that has passed ok, get back to the menu and select the first option to start up Ubuntu. When it loads, you get a nice desktop - click the Install icon to start setup and follow the couple easy steps that follow; in the partitioning step (number 2 or 3 I think) select the whole disk to be used (no resizing, no manual partitioning etc. - just format the whole disk; if you want to spare your personal data on the harddisk, select the option to resize existing partitions to create free space for Ubuntu
). In 15-60 minutes depending on your hardware you should be using Ubuntu then..