Computer randomly "sleeps" even while doing things?

I just reinstalled.

at least six times, including false-starts and a forgotten pasword :S.

I though I'd try our using UEFI, but it isn't easy (with some MB - like mine - not having UEFI supoport for CDFS and Windows disks not having the UEFI loader already configured.

Then I realize I forgot to reconfigure my BIOS (as I had updated it in hopes of improvements), and now I somehow broke the settings so even System Restore can't help.

Needless to say it's going to be a clean reinstall using MBR.

I'll be back if the problem has somehow returned.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Apple 17" iMac MA199LL (Early 2006)
OS
Windows 8 Pro (32-bit)
CPU
1.83GHz Intel Core Duo
Memory
2GB 667MHz DDR2 SDRAM (PC2-5300) (upgrade)
Graphics Card(s)
ATI Radeon X1600 with 128MB GDDR3 memory
Monitor(s) Displays
17-inch TFT active-matrix LCD, millions of colors
Screen Resolution
1440 x 900
Hard Drives
Hitachi 320GB HDT721032SLA360 7200RPM SATA II (upgrade)
Keyboard
Microsoft Wired Keyboard 600
Mouse
Microsoft Basic Optical Mouse v2.0
Internet Speed
4 Mbps
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
Other Info
WEI:
Base Score: 3.9 Processor: 4.4 Memory 4.7
Graphics: 3.9 Gaming Graphics: 4.1 Primary HD: 5.9
To install to GPT you'll need to set the BIOS Boot order so that the listing for EFI Boot Disk is first to boot. Then follow these steps: UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums.

If you instead want to install using MBR formatted HD, make sure EFI Boot disk is taken out of boot order priority and set DVD then HD to boot first. Check for any other EFI settings, and under SATA controller set to AHCI to try install first.
 
To install to GPT you'll need to set the BIOS Boot order so that the listing for EFI Boot Disk is first to boot. Then follow these steps: UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums.

If you instead want to install using MBR formatted HD, make sure EFI Boot disk is taken out of boot order priority and set DVD then HD to boot first. Check for any other EFI settings, and under SATA controller set to AHCI to try install first.

I'm back on using MBR.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Apple 17" iMac MA199LL (Early 2006)
OS
Windows 8 Pro (32-bit)
CPU
1.83GHz Intel Core Duo
Memory
2GB 667MHz DDR2 SDRAM (PC2-5300) (upgrade)
Graphics Card(s)
ATI Radeon X1600 with 128MB GDDR3 memory
Monitor(s) Displays
17-inch TFT active-matrix LCD, millions of colors
Screen Resolution
1440 x 900
Hard Drives
Hitachi 320GB HDT721032SLA360 7200RPM SATA II (upgrade)
Keyboard
Microsoft Wired Keyboard 600
Mouse
Microsoft Basic Optical Mouse v2.0
Internet Speed
4 Mbps
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
Other Info
WEI:
Base Score: 3.9 Processor: 4.4 Memory 4.7
Graphics: 3.9 Gaming Graphics: 4.1 Primary HD: 5.9
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