"Cannot proceed with Installation" Error during Vista Installation

I am trying to perform a clean install of Windows Vista Home Basic. I am
running a Dell Dimension 3000.

Processor: Pentium 4 2.8GHz
Memory: 1024 MB DDR SDRAM (333MHz)

During installation I get the message that "Windows detected that this
computer has 256Mb of RAM, but 512MB is required for installation.
Installation cannot proceed". I have checked with the BIOS setup utility and
I defntiely have 1GB RAM installed, and my PC meets the minimum system
requriements for Vista. Any ideas why Vista installation only thinks I have
256Mb RAM??

Thanks very much.

"nwb" <> wrote in message
news:1A907070-9824-451E-AFB9-...
>I am trying to perform a clean install of Windows Vista Home Basic. I am
> running a Dell Dimension 3000.
>
> Processor: Pentium 4 2.8GHz
> Memory: 1024 MB DDR SDRAM (333MHz)
>
> During installation I get the message that "Windows detected that this
> computer has 256Mb of RAM, but 512MB is required for installation.
> Installation cannot proceed". I have checked with the BIOS setup utility
> and
> I defntiely have 1GB RAM installed, and my PC meets the minimum system
> requriements for Vista. Any ideas why Vista installation only thinks I
> have
> 256Mb RAM??
>
> Thanks very much.

I'd look into a bios update on dells web site.