problem in booting

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http://askubuntu.com – I got a dell laptop (dell inspiron 1420) with windows vista by default I wanted to install linux ubuntu on it I burned the iso file to a 16GB flash memory and I booted the laptop from it when I tried to install ubuntu on the hard disk an error appeared so I tried to boot another time when I couldn't boot in the second time I booted from the hard disk and entered windows this time I burned the iso file to the hard disk (note: I have three partitions on the hard disk C:with windows D:for files and E:for linux another note that I used universal usb installer to install linux) when I restarted t (HowTos)