I need to upgrade this comp. Having problems with computer lagging and stalling when even just running windows. Here is the OS info.

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OS Information:
PropertyValue
OS Name Microsoft Windows XP Home Edition|C:\WINDOWS|\Device\Harddisk0\Partition1
Service Pack 0.0
OS Manufacturer Microsoft Corporation
Windows Directory C:\WINDOWS


Processor:
PropertyValue
Current Clock Speed 1594
Description x86 Family 15 Model 1 Stepping 2
Manufacturer GenuineIntel
Name Intel(R) Pentium(R) 4 CPU 1.60GHz


Memory (RAM):
PropertyValue
Bank Label
Capacity 268435456

Bank Label
Capacity 268435456

Bank Label
Capacity 524288

Total Memory Deteced in Hardware: ~512 MB
Memory Reported to Operating System: 511MB

Disk Drives:
PropertyValue
Description Disk drive
Manufacturer (Standard disk drives)
Model WDC WD400EB-11CPF0
Media Type Fixed hard disk media
Size 40015503360 (~37 GB)
Number of Partitions 2


Installed Printers:
PropertyValue
Name Microsoft Office Document Image Writer
Port Name Microsoft Document Imaging Writer Port:
Default False
Driver Name Microsoft Office Document Image Writer Driver

Name Canon MultiPASS F30 Printer
Port Name LPT1:
Default True
Driver Name Canon MultiPASS F30 Printer


Motherboard:
PropertyValue
Manufacturer Compaq
Model
Name Base Board
Part Number
Product 077Ch
Serial Number U204BBXZA227
Version


BIOS:
PropertyValue
Manufacturer Compaq
Name 686Y2 v2.06
Release Date 20011203******.******+***
Version COMPAQ - 20011203


Monitor:
PropertyValue
Description Plug and Play Monitor
Name Plug and Play Monitor
Screen Height 600
Screen Width 800


Keyboard:
PropertyValue
Description Standard 101/102-Key or Microsoft Natural PS/2 Keyboard

Description USB Human Interface Device


Pointing Device:
PropertyValue
Manufacturer Microsoft
Name PS/2 Compatible Mouse


Sound Card:
PropertyValue
Manufacturer Creative Technology, Ltd.
Description Creative EMU10K1 Audio Processor (WDM)
Device ID PCI\VEN_1102&DEV_0002&SUBSYS_806B1102&REV_07\4&122 329E2&0&50F0


Video Card:
PropertyValue
Adapter Compatibility NVIDIA
Adapter RAM 268435456
Description NVIDIA GeForce 6200
Installed Display Drivers nv4_disp.dll
Driver Version 6.14.10.9147
Driver Date 8/12/2006 4:42:42 AM
Video Mode Description 800 x 600 x 65536 colors


DirectX Installation:
PropertyValue
Version 6.03.01.0146


Modem:
PropertyValue
Model PCTEL Platinum V.90 Modem
Name PCTEL Platinum V.90 Modem


Network Adapters:
PropertyValue
Description Intel(R) PRO/100 VM Network Connection - Packet Scheduler Miniport
Description RAS Async Adapter
Description Packet Scheduler Miniport
Description WAN Miniport (L2TP)
Description WAN Miniport (PPTP)
Description WAN Miniport (PPPOE)
Description Direct Parallel
Description WAN Miniport (IP)
Description WAN (PPP/SLIP) Interface
Description Packet Scheduler Miniport

External Ports:
PropertyValue
External Reference Designator COM A
External Reference Designator COM B
External Reference Designator PAR
External Reference Designator USB 1
External Reference Designator USB 2
External Reference Designator KBD
External Reference Designator MOUSE
External Reference Designator
External Reference Designator
External Reference Designator
External Reference Designator
External Reference Designator
External Reference Designator Line I/O: MIC
External Reference Designator Line I/O: Line In
External Reference Designator HeadPhone & Line Out
External Reference Designator
External Reference Designator
External Reference Designator

Expansion Slots:
PropertyValue
Slot Designation AGP Slot J40
Slot Designation PCI Slot 1: J20
Slot Designation PCI Slot 2: J21
Slot Designation PCI Slot 3: J22