Welcom on Linuxmce.
We need more information from you about your system to help you with problems.
The best version for you to install is 14.04 this version is in developmend.
For assistance you can go to irc channel #Linuxmce on freenode.
Further to answer de your questions about the difference to Linuxmce and Dianemo is that Linuxmce is free and for Dianemo you need to buy a licence.
The software is almost the same.
Hopes this answered your questions.
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