I dont know where the model number on my computer is

Most probably your hardware ie graphic card do not support software requirements.

Autocad 2009 system requirements for Win XP.
32-bit AutoCAD 2009
Running under Windows XP:
•Microsoft Windows XP SP2 operating system
•Intel® Pentium® 4 processor or AMD Athlon®, 2.2 GHz or greater
or
Intel or AMD Dual Core processor, 1.6 GHz or greater
•1 GB RAM
•750 MB free hard disk space for installation
•1024x768 VGA with true color
•Microsoft Internet Explorer 6.0 (SP1 or higher)
If you are using AutoCAD for 3D modeling, you should bump up your system as follows:
•Intel Pentium 4 processor or AMD Athlon, 3.0 GHz or greater
or
Intel or AMD Dual Core processor, 2.0 GHz or greater
•2 GB RAM or greater
•2 GB of additional free hard disk space
•1,280 x 1,024 32-bit color video display adapter (true color) 128 MB or greater, OpenGL or Direct3D capable workstation class graphics card.

Hope it helps.

The sound is integrated onto the motherboard in this model, it isn't a separate card.

Hola amigo primero que nada devemos saber que systema operativo usa tu computador Windows Xp Vista or Windows 7

Esta Web cam es configura automaticamente per piensa tambien en los requerimientos del su systema. aqui algunos tips.

Habla en espanol y solo pregunta ok

Techbelkin

System Requirements Operating System For Windows®-based PC
Requires a PC that meets the requirements for and has installed one of these operating systems
Processor Windows® 7
Mmimimum: Intel Pentium 4 (3 GhZ), 1 GB of RAM; recommended: Intel Pentium (Dual-Core 1.8 GHz), 2 GB of RAM, 1250 MB free Windows Vista®
Mmimimum: Intel Pentium 4 (3 GhZ), 1 GB of RAM; recommended: Intel Pentium (Dual-Core 1.8 GHz), 2 GB of RAM, 1250 MB free

Windows® XP with Service Pack 2 (SP2) or later
Mmimimum: Intel Pentium 4 (3 GhZ), 1 GB of RAM; recommended: Intel Pentium (Dual-Core 1.8 GHz), 2 GB of RAM, 1250 MB free

Other CD-ROM

USB 1.1 (2.0 recommended)

16-bit color depth or higher, 2 MB or higher video memory

Windows-compatible speakers or headphones Internet Broadband Internet access may be required for certain features. Local and/or long-distance telephone toll charges may apply.

Internet functions also require Internet Explorer® 6/7 for installation; 25 MB hard-drive space typically required.

Have you tried to review the systems requirements for Windows 7? In case you don't, try to review this system requirements and see if your PC falls in. If not, then its the primary cause of the "lag" computer.

If you want to run Windows 7 on your PC, here's what it takes:

• 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
  
• 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
  
• 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
  
• DirectX 9 graphics device with WDDM 1.0 or higher driver
  

Minimum System Requirements
OS – Windows XP or Windows Vista
Processor – 2.8 GHz or faster (XP) or 3.2 GHz or faster* (Vista)
Memory – 1.0 GB RAM (XP) or 1.5 GB RAM (Vista)
Video Card –256 MB**
Hard Drive – 12GB
Sound Card – DirectX 9.0c compatible
* Supported Processors: Intel Pentium 4 2.8 GHz (3.2 GHz for Vista) or faster, Intel Core 2.0 GHz (2.2 GHz for Vista) or faster, AMD Athlon 2800+ (3200+ for Vista) or faster.
** Supported chipsets: NVIDIA GeForce 6800 GT or greater; ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or greater. Laptop versions of these chipsets may work but are not supported. Integrated chipsets are not supported. Updates to your video and sound card drivers may be required.
Recommended System Requirements
OS – Windows XP / Vista
Processor – Intel Core 2 DUO @ 2.2GHz or AMD Athlon 64 X2 4400+
Memory – 2.0 GB RAM
GPU – NVIDIA GeForce 8800 GTS/640 or similar

Hi,

it is not complicated for upgrade the desktop.as per my knowledge ur system configuration is-

Key Features
Form Factor Mini Tower
Processor Intel Pentium 4 1.6 GHz
Installed Memory 256 MB (SDRAM)
Operating System Microsoft Windows XP Home Edition
Recommended Use Business

ur system processor and memory both will be upgrade.
 
Memory-
RAM Technology SDRAM
Installed RAM -256 MB 
Max Supported RAM 3 GB
Installed Video Memory 32 MB

Processor-
Processor Type Intel Pentium 4
Processor Speed 1.6 GHz
Processor Manufacturer Intel
Processor Upgradability Upgradable

Audio / Video-
Audio Output Type Sound Card
Max. Video Resolution 1920 x 1440

Hard Drive-
Hard Drive Capacity 40 GB
Hard Drive Interface DMA/ATA-100 (Ultra)

Thanks,

It should work if you have other recomendations Supported OS: Windows XP (only) Processor: 3 Ghz Pentium 4 or AMD Athlon 3000 (3.5 Ghz Pentium 4 or Athlon 3500 recommended) - Game optimized for dual-processor-enabled computers. RAM: 1 GB (1.5 GB recommended) Video Card: DirectX 9.0c-compliant, Shader 3.0-enabled 128 MB video card (256 MB recommended) (see supported list*) Sound Card: DirectX 9.0c-compatible (EAX recommended) ? PC audio solution containing Dolby Digital Live required for Dolby Digital audio. DirectX Version: 9.0c or higher (9.0c included on disc) DVD-ROM: 4x CD-ROM or faster Hard Drive Space: 8 GB Peripherals Supported: Mouse, keyboard Multiplay: Broadband connection with 128 kbps upstream or faster

the requirements are


FOR WINDOWS XP

• Windows XP (Service Pack 2)
• 2.0 GHz P4 processor or equivalent
• 1 GB RAM
• At least 6.5 GB of hard drive space with at least 1 GB additional space for custom content
• 128 MB Video Card with support for Pixel Shader 2.0

FOR WINDOWS VISTA

• Windows Vista (Service Pack 1)
• 2.4 GHz P4 processor or equivalent
• 1.5 GB RAM
• At least 6.5 GB of hard drive space with at least 1 GB additional space for custom content
• 128 MB Video Card with support for Pixel Shader 2.0

For computers using built-in graphics chipsets, the game requires at least:

• Intel Integrated Chipset, GMA X3000 or above.
• 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent
• 0.5 GB additional RAM

So what does your computer have?

heres more info on the game
http://en.wikipedia.org/wiki/Crysis

Operating System - Windows XP or Windows Vista
CPU Minimum - 2.8 GHz or faster for XP, 3.2 GHz or faster for Vista

cpu Recommended - Intel Core 2 Duo @ 2.2 GHz, or AMD Athlon 64 X2 4400+

Memory - 1 GB RAM for XP, 1.5 GB RAM for Vista
Recommended - 2 GB RAM

Hard Drive Space - 12 GB of free space

Minimum Graphics Hardware - 256 MB video memory, NVIDIA GeForce 6800 GT/ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or greater

Recommended - NVIDIA GeForce 8800 GTS 640MB or ATI 2900XT 512MB

Sound Hardware DirectX 9.0c compliant card

Looks like your graphics card may be a little weak.
Also check your ram.

Here are the MINIMUM requirements.

OS: Windows XP with SP2 or Windows Vista
* Processor: 1 .8GHz or faster (2.4GHz for Vista)
* RAM: 1GB or more (2GB for Vista)
* Video: DirectX 9.0c/10 compatible device w/ 128MB RAM or better and Pixel Shader 2.0 support; requires NVIDIA GeForce 6200/ATI Radeon 9000 chipset or greater
* Audio: DirectX 9.0c compatible device
* Disc drive: 8x DVD or faster
* Hard drive: 6 GB or more free space
* Input: Keyboard and mouse
* Internet: Connection required for multiplayer