Sleep mode and Error Code 643

I have a fresh install of Vista is working fine on a Gateway PC except when
I put it in sleep mode. The following error appears when I try to go into
sleep mode:-

> Security Update for Microsoft .NET Framework, Version

> 1.1 Service Pack 1 (KB929729)

>

> Installation date: ý7/ý29/ý2007 7:41 PM

>

> Installation status: Failed

>

> Error details: Code 643

>

> Update type: Important

>

> A security issue has been identified that could allow an attacker to

> compromise your Windows-based system running the Microsoft .NET

> Framework and gain complete control over it. You can help protect your

> computer by installing this update from Microsoft. After you install

> this item, you may have to restart your computer.

After a request to not turn off power the computer attempts to install the
problem update and then turns off the computer instead of going into sleep
mode. It never seems to install. Since it repeats each time I go to sleep
mode.



Any suggestions.