That happened to many other people that I know and they just reinstalled , I get weird colors , I get Purple , Then Black , Then A Gray , Then Black and then Desktop ussually , I find it normal being the colors for Ubuntu and GRUB , so I let it be ,
I would recommend you running Windows 7 and try either options
Download the Ubuntu Wubi.exe installer on Windows 7 like you did the first time most likely and re-install Ubuntu and it will replace the old copy.
Download the Ubuntu 12.10 .iso file , Put it on a USB (Fully Empty!), Then Extract it by Right Clicking and Click "Extract Here" , Then shut off your computer , Then when turning on (FOR a HP , Click ESC , Then F9) So either ESC or F9 , You will get a list
CD ROM Drive
USB Flash Drive Here (Generic , SanDisk , Many names for it)
Click the Flash Drive and you will get a Ubuntu Desktop and it asks "Would you like to install Ubuntu?" Then you follow the steps and it will be installed and replace the old copy that you have.
If either fails , Look online for other options , I hope I helped you a bit and I can help more if you need further guidance , I am also new to the System but I have previous information about windows so Ubuntu is just a new step, Learn it , Then nothing is hard for you!