In game (WoW and EQ) random freezes, blank black, or reboots

First let me say Thank You! and Second I do well to turn the computer on so please be very step by step...
Month ago I installed a new video card on my system, it seemed very standard...as stated in subject I play EQ and WoW..while in game the system froze...no mouse movement nothing...got it going again and it rebooted... these freezes, blank black screen or restart are random I can be on for hour and nothing or 5mins and poof...friends in game told me to look at my power supply and make sure it was not running hot..I discovered my power supply was 230watts and video card call for min 300watts..I got a new ps 500watts w/2 fans..(sys has one fan on mb that is funneled out side and one fan on back to pull air out of case)...again the same freezes ..blank black screen or the restarting of the system..I am at a lost at this point I have read it seems thousands of links, sites, and threads ..here is the specs from my system and I hope I do this right...
Again Thank you

Field Value
Computer
Operating System Microsoft Windows XP Home Edition
OS Service Pack Service Pack 2
DirectX 4.09.00.0904 (DirectX 9.0c)



Motherboard
CPU Type AMD Athlon XP, 1666 MHz (12.5 x 133) 2000+
Motherboard Name Syntax SV266M(A) (3 PCI, 1 AGP, 1 CNR, 2 DIMM, Audio, Video)
Motherboard Chipset VIA VT8375 ProSavageDDR KM266
System Memory 512 MB (DDR SDRAM)
BIOS Type Award (08/19/03)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)

Display
Video Adapter NVIDIA GeForce 6200 A-LE (256 MB)
3D Accelerator nVIDIA NV44AGP
Monitor Samsung SAMTRON 75(M)E (Plus) [17" CRT] (HCCN603031)

Multimedia
Audio Adapter VIA AC'97 Enhanced Audio Controller

Storage
IDE Controller VIA Bus Master IDE Controller
Floppy Drive Floppy disk drive
Disk Drive SAMSUNG SV0401H (40 GB, 5400 RPM, Ultra-ATA/100)
Optical Drive TOSHIBA DVD-ROM SD-R1312 (DVD:12x, CD:32x/10x/40x DVD-ROM/CD-RW)
SMART Hard Disks Status OK

Partitions
C: (NTFS) 38201 MB (18929 MB free)

Input
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse PS/2 Compatible Mouse

Network
Network Adapter Realtek RTL8139/810X Family PCI Fast Ethernet NIC (192.168.1.101)
Modem HSP56 MR

Peripherals
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB2 Controller VIA USB 2.0 Enhanced Host Controller

ps...the troubleshooting section in the book that came with video card says to go and update my drivers for my mb/chipset

 

Sorry any confusion I accidently posted twice, thank you