Hi,

Two things come to mind that "may" be causing this.

1. Have you tried to right click the install.exe and select Run as
Administrator?
2. You do have UAC enabled don't you?

--
All the best,
SG

Is your computer system ready for Vista?
[url]https://winqual.microsoft.com/hcl/[/url]

"khaled" <khaled-elashry@nileprojects.com> wrote in message
news:%23HrOoV1rIHA.1952@TK2MSFTNGP05.phx.gbl...[color=blue]
> hello
>
> when tring to install SQL server Managment Studio Express on windows vista
> i
> got the following message :
>
> [ Windows Installer
> This installation package could not be opened. contact the application
> vendor to verify that this is a valid windows installer package ]
>
>
> any help please.
>
> Thanks.
>
>[/color]