System Standby or Hibernation Problem

I have a XP desktop that was recently updated to SP3.  After 15-20 minutes of being idle, it goes into what appears to be a system standby state.  It didnt do this before the updates and I want to turn it off because this user works from home using SSLVPN and it she can't connect unless the PC is active.  I checked and changed the power options from the control panel to (never/never/never) and I made sure that hibernation was not selected for this user and for the Admin account.  After a reboot, the computer is still entering this power saving mode (power button blinks and the PC will resume open windows quickly after a push of the button).  What am I missing?  Thanks.
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    first check which power scheme is your desktop under
go to control panel>>power options>>power schemes(tab) and then set your preferences
if it still doesn't work disable hibernation in control panel>>power options>>Hibernate(tab)
dmansfieldAuthor Commented:
Thanks for the suggestions.  I had already checked the control panel options for both this user and the admin account.  Both power schemes are 'always on' and hibernate is not checked on either.  I have even checked the power management options in the BIOS and all looks as it should, but the PC is still entering a standby state.
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Windows XP

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