Got a few games which I can't play-Help!

[shakaza]

Hi, I got a few PC games that I'd like to play but I don't think that my current integrated video card would work with it. Here are my PC specs:

Processor
Model : Intel(R) Pentium(R) D CPU 3.00GHz
Speed : 3.00GHz
Cores per Processor : 2 Unit(s)
Threads per Core : 1 Unit(s)
Type : Dual-Core
Internal Data Cache : 2x 16kB, Synchronous, Write-Thru, 8-way set, 64 byte line size
L2 On-board Cache : 2x 2MB, ECC, Synchronous, ATC, 8-way set, 64 byte line size, 2 lines per sector

System
System : PACKARD BELL BV ISTART F2310 AIO
Mainboard : PACKARD BELL BV GA-T671MG
Bus(es) : ISA AGP PCI PCIe USB
Multi-Processor (MP) Support : 1 Processor(s)
Multi-Processor Advanced PIC (APIC) : No
System BIOS : Phoenix Technologies, 255.255
Total Memory : 767MB

Chipset 1
Model : NEC Computer International ??? (0671)
Front Side Bus Speed : 4x 200MHz (800MHz data rate)

Video System
Monitor/Panel : Generic PnP Monitor
Adapter : SiS Mirage 3 Graphics
Imaging Device : Lexmark 1200 Series
Imaging Device : Logitech QuickCam Pro 5000

Physical Storage Devices
ST3160215AS (ATA) : 149GB (C:)
Generic USB SD Reader (USB) : N/A (E:)
Generic USB CF Reader (USB) : N/A (F:)
Generic USB SM Reader (USB) : N/A (G:)
Generic USB MS Reader (USB) : N/A (H:)
SONY DVD RW AW-G170A (ATAPI) : N/A (D:)

Logical Storage Devices
_OEMBP : 8GB (3.7GB, 46% Free Space) (NTFS)
HDD (C:) : 141GB (76GB, 54% Free Space) (NTFS) @ ST3160215AS (ATA)
CD-ROM/DVD (D:) : N/A @ SONY DVD RW AW-G170A (ATAPI)
Removable Drive (E:) : N/A @ Generic USB SD Reader (USB)
Removable Drive (F:) : N/A @ Generic USB CF Reader (USB)
Removable Drive (G:) : N/A @ Generic USB SM Reader (USB)
Removable Drive (H:) : N/A @ Generic USB MS Reader (USB)

Peripherals
USB Controller/Hub : SiS 7001 PCI to USB Open Host Controller
USB Controller/Hub : SiS 7001 PCI to USB Open Host Controller
USB Controller/Hub : Standard Enhanced PCI to USB Host Controller
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : USB Root Hub
USB Controller/Hub : Generic USB Hub
USB Controller/Hub : USB Printing Support
USB Controller/Hub : USB Composite Device
USB Controller/Hub : USB Mass Storage Device
Keyboard : Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse : HID-compliant mouse
Human Interface : USB Human Interface Device

Printers and Faxes
Model : Microsoft XPS Document Writer
Model : Lexmark 1200 Series (Copy 1)
Model : Lexmark 1200 Series

Power Management
Mains (AC) Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows Vista Home Media Center 6.00.6000
Platform Compliance : Win32 x86

Network Services
Adapter : Realtek RTL8139/810x Family Fast Ethernet NIC

As I said, the current SiS Mirage graphics card is integrated and it robs 256mb RAM off my computer so my computer is in fact 1024mb RAM and I heard SiS Mirage the worst kind to get. I am thinking of getting a GeForce 8600GT 256mb instead which would cost me about £50 from Newegg. Also the games that I want to be able to play are:

(In order of priority)
Counter Strike Source
Age of Empire 3
The Orange Box games
Battlefield 2142

I don't mind playing in medium quality but prefer to be in best quality when possible. I don't think any of these games asks for too much right?

The questions that I have are:

1. Does my motherboard support PCI Express? I think it does since nearly all new computer have it and I got mine 3 months ago

2. Is my choice of video card good? If not make a suggestion, I'd like to keep the budget to around $100/£50 if possible

3. Does my 256mb RAM return if I get a new video card? If not, is there any way of getting it back? Would I need to uninstall the older driver first?

4. Is the RAM I have now sufficient for the games I intend to play?

5. What RAM is compatible with my computer and has my motherboard got enough slots for the extra stick(s) of RAM needed? If I need RAM I will probably buy the 1 GB ones

If there are any other PC specs you like me to add just post and I'll try and get it, you might have to tell me where to find it first :3

Ta

[pharoah]

its the integrated graphics!those games are not going to play on sis integrated graphics.