having trouble installing kubuntu

[linux_smz]

i am trying to build a machine to hold my excess of files away from my 
windows machine as in the past i have had to clear it around twice a 
year to fix all the annoying windows problems.  i decided to use kubuntu 
as i had used it before for a similar purpose for my friend. however 
when i run the disk i get unto kubuntu and start the install it goes 
through the options as normal but when it starts the installation it 
tells me it cannot find a root directory. does anyone know what this 
problem could be caused by and how do I fix it.
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