nero 2015 platinum wont install

hi all,i have a problem installing 2015 platinum. to start with my mate put 2015 on my pc and after a short while it stopped working saying serial number not recognized. i assume it was a dodgy copy,sorry for that. anyroad up i purchased a copy of platinum 2015 from amazon and it wont install saying a newer version is on my pc and to uninstall that first. error code 2732 directory manager not initialized comes up.i have taken off everything i can find relating to nero and i have gone thru the registry five times but still cant install.
any ideas anyone ???
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