Thank you Michael, installing the update fixed the problem for me.

"MICHAEL" <u158627_emr@dslr.net> wrote in message
news:eo$YrrETHHA.4632@TK2MSFTNGP04.phx.gbl...[color=blue]
>
> "Greene" <Greene@discussions.microsoft.com> wrote in message
> news:E3001637-F69B-4AAC-A8A1-564905272EBC@microsoft.com...[color=green]
>>I put the pc to sleep and it wakes again within a few minutes. Any
>> suggestions?[/color]
>
> Do you have a wireless mouse? Try unplugging
> your USB devices one by one, put the computer
> to sleep after you unplug one. If it stays asleep,
> then you'll know. Have you gone into Device Manager
> and looked at your USB devices, specifically, the
> Power Management tab?
>
> Do you have the latest drivers for any USB devices
> you may be using?
>
> Have you installed this update? It might help.
> [url]http://support.microsoft.com/?kbid=925528[/url]
> Reliability update for the USB stack in Windows Vista
> January 30, 2007
>
>
> -Michael[/color]