Hi thanks for your reply.

I try to install a STAND-ALONE configuration...

I work on a PC Windows7 ...

Some months ago i installe on the same PC a trial version...

All it was successfully.

Now this version is expired so i need to install a Professional Version...(with Product Key)

I will use this SQL SERVER 2012 version to study TABULAR MODE ...

Thanks i hope can help me...:-)

I tried to install as a Default Instance and also a Named Instance...but i receive the same error.

Regards.