Windows Vista Freezes

i purchased Vista Premium edition.. it periodically freezes and I can only hit the restart button or shut it off. Here its what im running. I have searched many places and havent found a specific reason. Any suggestions? Here are my specs



Computer:
Computer Type ACPI x86-based PC
Operating System Microsoft Windows Vista Home Premium
OS Service Pack -
Internet Explorer 7.0.6000.16386 (IE 7.0 - Vista)
DirectX DirectX 10.0


Motherboard:
CPU Type AMD Athlon 64, 2400 MHz (12 x 200) 3800+
Motherboard Name MSI K8N Neo4 Platinum v3.0 ROHS (MS-7125) (4 PCI, 1 PCI-E x1, 1 PCI-E x16, 4 DDR DIMM, Audio, Gigabit LAN, IEEE-1394)

Motherboard Chipset nVIDIA nForce4 Ultra, AMD Hammer
System Memory 2048 MB (PC3200 DDR SDRAM)
BIOS Type Award (07/21/06)
Communication Port Communications Port (COM1)
Communication Port Printer Port (LPT1)

Display:
Video Adapter VIDIA GeForce 7600 GS (Microsoft Corporation - WDDM)
Video Adapter NVIDIA GeForce 7600 GS (Microsoft Corporation - WDDM)
3D Accelerator nVIDIA GeForce 7600 GS
Monitor Gateway VX700 [17" CRT] (908094528)

Multimedia:
Audio Adapter Creative Audigy 4 (SB0610) Sound Card
Audio Adapter Realtek ALC850 @ nVIDIA nForce4 (CK8-04) - Audio Codec Interface

Storage:
IDE Controller Standard Dual Channel PCI IDE Controller
IDE Controller Standard Dual Channel PCI IDE Controller
IDE Controller Standard Dual Channel PCI IDE Controller
Storage Controller Microsoft iSCSI Initiator
Floppy Drive Floppy disk drive
Disk Drive Maxtor 6L200P0 ATA Device (200 GB, 7200 RPM, Ultra-ATA/133)
Disk Drive WDC WD600BB-00CAA1 ATA Device (31 GB, IDE)
Optical Drive CREATIVE CD4833E BC102 ATA Device (48x CD-ROM)
Optical Drive SONY CD-RW CRX220E1 ATA Device (52x/24x/52x CD-RW)
SMART Hard Disks Status OK

Input:
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse Microsoft USB IntelliMouse Explorer 3.0