Need Help W/ Dual Monitor Set Up

Trying to set up dual monitors. I read through three threads that were already posted - "using 2 monitors", "dual monitor & extend desktop" and "dual monitor help". So I am trying and after reading thru all the threads I think I understand it more. I'm guessing that even though win xp is supposed to support dual monitors in my case it isn't so I think I need to get some software to make it happen. I have a laptop (system info below) I just took an old monitor of mine and plugged it into the back of my laptop. According to the "help" when I go to the settings tab on "display" I should see a check box for "extend my win desktop onto this monitor". don't see this. Reading some more it's possible I need a PCI or AGP video adapter, but don't know if I have one and not sure how to check. Reading some more it's possible that I have an onboard video adapter and don't even know how to check if I have one of those. Please help. Send me in the right direction. I love to research problems and I'm willing to learn.

OS Name Microsoft Windows XP Home Edition
Version 5.1.2600 Service Pack 1 Build 2600
OS Manufacturer Microsoft Corporation
System Name COMPUTERNAME
System Manufacturer Compaq
System Model Presario 732US US 470033-480
System Type X86-based PC
Processor x86 Family 6 Model 6 Stepping 2 AuthenticAMD ~1295 Mhz
BIOS Version/Date Phoenix 4.06CJ15, 6/28/2002
SMBIOS Version 2.3
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\System32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.1106 (xpsp1.020828-1920)"
User Name COMPUTERNAME\user
Time Zone Eastern Standard Time
Total Physical Memory 256.00 MB
Available Physical Memory 36.70 MB
Total Virtual Memory 826.45 MB
Available Virtual Memory 390.88 MB
Page File Space 586.97 MB
Page File C:\pagefile.sys

Name S3 Graphics Twister K Compaq​

PNP Device ID PCI\VEN_5333&DEV_8D02&SUBSYS_00860E11&REV_01\4&9AEDED5&0&0008
Adapter Type S3 Twister-K, S3 Graphics, Inc. compatible
Adapter Description S3 Graphics Twister K Compaq
Adapter RAM 16.00 MB (16,777,216 bytes)
Installed Drivers s3gnb.dll
Driver Version 6.13.10.1026-13.93.04
INF File oem20.inf (S3Twistr section)
Color Planes 1
Color Table Entries 4294967296
Resolution 1024 x 768 x 60 hertz
Bits/Pixel 32
Memory Address 0xE8100000-0xE81FFFFF
Memory Address 0xF0000000-0xF7FFFFFF
I/O Port 0x000003B0-0x000003BB
I/O Port 0x000003C0-0x000003DF
Memory Address 0xA0000-0xBFFFF
Driver c:\windows\system32\drivers\s3gnbm.sys (6.13.10.1026-13.93.04, 118.75 KB (121,600 bytes), 12/12/2001 3:06 PM)

 

yeah i don't see the(1) (2) thing on my settings tab when I plug in the other monitor. I'm going to try to find a manufacturer web site for my card "S3 Graphics Twister K". Off to do more reading. Let ya'll know what I find out.

 

its the Fn or Function key that switches it, but that will only display the same thing on both monitors. that is there for presentations, etc. he needs the Extend desktop checkmark.