Ubuntu start up screen broken

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http://askubuntu.com – I set up dual boot on my extra pc last night. first installed windows 7 and that went just fine. Downloaded Ubuntu and then did the MD5SUM and did not get a correct return that were listed on the site. I forgot to do that before I burnt the image to a disc. so I booted from the disc anyway to do the intergrity check and no errors were found. I then installed and everything seems fine except when it's booting, the purple screen is broken. should I try to redownload and re install? (HowTos)