Thank you so much for your prompt answer .
I tried what you said by desinstall and re-install NTE framework.4. of course clean up the register before re-installing
Unfortunatly ; this has not resolved the problem.

I'm trying to find other solution .. if you have any other idea.. please, let me know.
thanks again
your fairhfully

ON my PC vista 64B when i install Plan G I have the following Msg

error 1001.InstallUtilLib.dll.Unknown error
and then this happen almost at the end of installing Plan G which stop at this moment and cancel all installation.

Is some body could help me for a proper installation .
Many thanks in advance
GiB