How to Fix Error - Computer shuts down without warning at the same time each night?

Computer shuts down without warning at the same time each night

The last week or so I have been up late working on my PC.
Between 1:39 and 1:45am EACH MORNING, my PC shuts down with no warning.
I get asked if I would like to save my work (Notepad, Photoshop)but never have enough time to actually save my work because
the shut down continues.
When I start back up, the PC starts like normal.
Task scheduler shows one update for Adobe at 2 am daily, but it makes no sense that the PC would shut down 20 minutes early for a program update.

How do I fix this? My PC is only 9 months old.

PC Specs:

HP Pavilion Elite HPE-400z series
• Genuine Windows 7 Professional 64-bit
• AMD Athlon(TM) X4 635 quad-core processor [2.9GHz, 2MB L2, up to 4000MHz bus]
• 6GB DDR3-1333MHz SDRAM [3 DIMMs]
• 1TB 7200 rpm SATA 3Gb/s hard drive
• 1GB NVIDIA GeForce 315 [DVI, HDMI, VGA adapter]
• LightScribe 16X max.
DVD+/-R/RW SuperMulti drive
• Integrated Ethernet port, No wireless LAN
• 15-in-1 memory card reader, 1 USB, 1394, audio
• Integrated sound

Anwsers to the Problem Computer shuts down without warning at the same time each night

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Hello babyrocasmama,
 
 Are you seeing any error's or messages after your computer reboots?  Is your computer in sleep/hibernate mode when it reboots?  How long has this issue been occuring? 
 I would first confirm your computer is updated with the latest firmware, drivers and BIOS through HP's site below.  I would also try this.  Boot your computer in a Clean Boot state before you leave the computer and verify if it has rebooted in the morning. 
Please let us know status.
 
HP support site:
http://h10025.www1.hp.com/ewfrf/wc/product?product=4343015&cc=us&dlc=en&lc=en&product=4343015&tmp_track_link=ot_search
 
Clean boot:
http://support.microsoft.com/kb/929135
 
Thanks

Machine Throttling

• Go to the Start button.
• In the Search box, type "regedit" (without quotes) and press Enter.
• Look for the following registry key: "HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\ SQMClient\Windows\DisabledSessions".
• On the right window pane, delete the subkey: "Machine Throttling".
• Restart your system.

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