pivot the blue

Hi Guys, I guess this topis is a bit old now, however i do hope someone can help me. I created 7Zip Symantec corp. install. It works like a charm, however if I try to install it via RunonceEx It fails to install. It's unzipping and when startx should have run msi, msg box with following text appears: StartX, No parameters spcified. For a complete description of the command line parameters StartX accepts, click "Help" Can you see the problem? The package works when it's run inside windows and RunonceEx does start it however there is some wierd problem that it does not wan't to install.