Question : Problem: Computer powers off all the time, even when I choose restart.

Hello, whenever I install a new program or even when I just try to restart my computer 90% of the time the computer powers off instead of restarting. Now here's  the problem. When I turn it back on, I see the lights go on like normal, but then it just sits there and never loads up. The only way I can get it to load up again is if I unplug the power cord from the back then while it's still unplugged, I have to push the power button. For a second I see the lights flicker (I think it's draining whatever power is left in the computer), Then I plug the power cord back in, hit the power button and then it loads up normally. I've installed different windows' and it still does the same thing, I've done it with no extra devices and still the same. Here's my specs if anyone needs them. Thanks.

Processor
Model : 1x AMD Athlon(tm) 64 X2 Dual Core Processor 4800+
Speed : 2.41GHz
Model Number : 4800 (estimated)
Cores per Processor : 2 Unit(s)
Threads per Core : 1 Unit(s)
Type : Dual-Core
Internal Data Cache : 64kB Synchronous, Write-Back, 2-way set, 64 byte line size
L2 On-board Cache : 1MB ECC Synchronous, Write-Back, 16-way set, 64 byte line size

Mainboard
Bus(es) : ISA PCI PCIe IMB USB FireWire/1394 i2c/SMBus
MP Support : 2 Processor(s)
MP APIC : Yes
System BIOS : Phoenix Technologies, LTD 6.00 PG
Mainboard : NF-CK804
Total Memory : 2GB DDR-SDRAM

Chipset 1
Model : Advanced Micro Devices (AMD) Athlon 64 / Opteron HyperTransport Technology Configuration
Front Side Bus Speed : 2x 1005MHz (2010MHz data rate)
Total Memory : 2GB DDR-SDRAM
Memory Bus Speed : 2x 201MHz (402MHz data rate)

Video System
Monitor/Panel : Plug and Play Monitor
Adapter : NVIDIA GeForce 7800 GTX

Physical Storage Devices
Removable Drive : Floppy disk drive
Hard Disk : WDC WD3200KS-00PFB0 (298GB)
CD-ROM/DVD : LITE-ON DVDRW SHM-165H6S (CD 48X Rd, 48X Wr) (DVD 6X Rd, 6X Wr)

Logical Storage Devices
Hard Disk (C:) : 100GB (92GB, 92% Free Space) (NTFS)
Local Disk (E:) : 98GB (1.1GB, 1% Free Space) (NTFS)
Hard Disk (D:) : 100GB (45GB, 45% Free Space) (NTFS)
CD-ROM/DVD (F:) : N/A
3.5" 1.44MB (A:) : N/A

Peripherals
Serial/Parallel Port(s) : 1 COM / 1 LPT
USB Controller/Hub : Standard OpenHCD USB Host Controller
USB Controller/Hub : Standard Enhanced PCI to USB Host Controller
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
FireWire/1394 Controller/Hub : VIA OHCI Compliant IEEE 1394 Host Controller
Keyboard : Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse : PS/2 Compatible Mouse

MultiMedia Device(s)
Device : ARGUS SDK WDM Video Capture
Device : ARGUS SDK WDM Audio Capture
Device : Realtek AC'97 Audio
Device : Hauppauge WinTV PVR PCI II (23xxx) (Tuner 1)
Device : Hauppauge WinTV PVR PCI II (23xxx) (Tuner 2)

Power Management
Mains (AC) Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows XP/2002 Professional 5.01.2600 (Service Pack 2)
Platform Compliance : Win32 x86

Network Services
Network Drivers Enabled : No

Performance Tips
Warning 100 : Large memory sizes should be made of Registered/Buffered memory.
Tip 2546 : Large memory modules should be ECC/Parity.
Notice 5901 : CD 1x= 150kB/s; Exercise caution when comparing measured versus published ratings.
Notice 5902 : DVD 1x= 11.08Mbps Exercise caution when comparing measured versus published ratings.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.

Answer : Problem: Computer powers off all the time, even when I choose restart.

i would check to see if the APM features (advanced power management) for your motherboard are enabled. its a pretty new processor/mobo, so it should be available, just check if its enabled. then i'd try updating the bios. also see if the front panel wires are connected to the motherboard properly (like the power switch, reset switch, hard drive led, etc.).