Comp freezes game does not

Hi I"m Shaleen and I'm new to these forums and I've been having an ongoing problem with my computer for a while. My system info is below not sure why it's so big. Well my problem is with most MMORPGS, when I start any one up I can play from anywhere between 3 to 5 minutes and then all of a sudden my Keyboard and mouse completely stop functioning, I can hear all the sounds and i can see everyone else moving. Sometimes when the lockup happens my character is still moving but I have no control over it I remove my keyboard to see if the character will stop but it keeps running and I have no control over it, I really don't know what could be the problem and any help is greatly appreciated thanks in advance.

System Information
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Machine name: HOME-M7LBMDPVQT
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
Language: English (Regional Setting: English)
System Manufacturer: HP Pavilion 04
System Model: P6319A-ABA 750N
BIOS: Award Medallion BIOS v6.0
Processor: Intel(R) Pentium(R) 4 CPU 1.60GHz
Memory: 512MB RAM
Page File: 352MB used, 896MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)

Card name: NVIDIA GeForce FX 5200
Manufacturer: NVIDIA
Chip type: GeForce FX 5200
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0322&SUBSYS_00000000&REV_A1
Display Memory: 128.0 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)
Monitor: Default Monitor
Monitor Max Res:
Driver Name: nv4_disp.dll
Driver Version: 6.14.0010.7772 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 6/15/2005 05:20:00, 3896320 bytes