I have a problem playing certain videos because I havent installed the driver for the video controller. I know this because when I go to add hardwar in the control panel there is a yellow question mark next to the video controller.

For instance my youtube videos work fine but when I try play video [mpg files] on windows media player the computer takes up the entire memory and runs incredibly slow that you have to wait at least a minute to open a window.

How do I know which driver to install?

oops acedently bumped the introduction topic so people might not see mine /bump

What is the make and model of the controller? What is the Operating System?

The manufacturer's web site will have the drivers.

I use windows xp, how do I find out the make and model of the controller?
I recently reformatted the comp.

Is it not identified under Add Hardware where you see the yellow ?

If not try the Device Manager: start Run... devmgmt.msc

Look under Display Adapters and or Other Devices if it comes up as a yellow ?

thnx, I did that. It just has video controller with the yellow ?

The info it gives is:
device type: Other devices
manufactorer: Unknown
location: PCI bus 0, device 2, function 0

but it doesnt tell me anything about it

Is this a new problem? Have you just installed this card?

Here is another scan you can try:

http://www.d-a-l.com/hardware-scan.php

This is the result
How do I know which is the video controller?

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OS Information:
PropertyValue
OS Name Microsoft Windows XP Home Edition|C:\WINDOWS|\Device\Harddisk0\Partition1
Service Pack 2.0
OS Manufacturer Microsoft Corporation
Windows Directory C:\WINDOWS


Processor:
PropertyValue
Current Clock Speed 1997
Description x86 Family 15 Model 2 Stepping 4
Manufacturer GenuineIntel
Name Intel(R) Pentium(R) 4 CPU 2.00GHz


Memory (RAM):
PropertyValue
Bank Label RAS 0 & 1
Capacity 268435456

Bank Label RAS 2 & 3
Capacity 268435456

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

Disk Drives:
PropertyValue
Description Disk drive
Manufacturer (Standard disk drives)
Model ST380011A
Media Type Fixed hard disk media
Size 80023749120 (~75 GB)
Number of Partitions 2


Installed Printers:
PropertyValue

Motherboard:
PropertyValue
Manufacturer
Model
Name Base Board
Part Number
Product P4I45Gx_PE,
Serial Number 00000000
Version 1.00


BIOS:
PropertyValue
Manufacturer American Megatrends Inc.
Name Version 1.00
Release Date 20040601000000.000000+000
Version AMIINT - 10


Monitor:
PropertyValue
Description Plug and Play Monitor
Name Plug and Play Monitor
Screen Height 768
Screen Width 1024


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


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


Sound Card:
PropertyValue
Manufacturer Microsoft
Description Unimodem Half-Duplex Audio Device
Device ID MODEMWAVE\0\{AB2B6B90-23BA-401F-BB21-04B62DB6E6F0}

Manufacturer C-Media
Description C-Media AC97 Audio Device
Device ID PCI\VEN_8086&DEV_24C5&SUBSYS_434D1849&REV_02\3&13C 0B0C5&0&FD


Video Card:
PropertyValue
Adapter Compatibility NVIDIA
Adapter RAM 268435456
Description NVIDIA GeForce 6600 LE
Installed Display Drivers nv4_disp.dll
Driver Version 6.14.10.7801
Driver Date 8/2/2005 8:35:00 AM
Video Mode Description 1024 x 768 x 4294967296 colors


DirectX Installation:
PropertyValue
Version 6.03.01.0148


Modem:
PropertyValue
Model Intel(R) 536EP Modem
Name Intel(R) 536EP Modem


Network Adapters:
PropertyValue
Description Realtek RTL8139 Family PCI Fast Ethernet NIC - 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 Packet Scheduler Miniport

External Ports:
PropertyValue
External Reference Designator PS2 Keyboard
External Reference Designator PS2 Mouse
External Reference Designator COM Port
External Reference Designator LPT Port
External Reference Designator Rear USB 0
External Reference Designator Rear USB 1
External Reference Designator Rear USB 2
External Reference Designator Rear USB 3
External Reference Designator Front USB 4
External Reference Designator Front USB 5
External Reference Designator ETHERNET
External Reference Designator LINE-OUT
External Reference Designator LINE-IN
External Reference Designator MICROPHONE
External Reference Designator Game Port

Expansion Slots:
PropertyValue
Slot Designation PCI1
Slot Designation PCI2
Slot Designation PCI3
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Driver Installation Hints


"Download Accelerator" utilities should be disabled when downloading any drivers.


Do not run virus protection software in the background while installing the drivers. This prevents the driver from configuring itself properly.


Before installing new drivers make sure you uninstall all NVIDIA display drivers from the Windows Control Panel. Browse to the Start Menu > Windows Control Panel > Add/Remove Programs and search for "NVIDIA Windows Display Drivers" or "NVIDIA Display Drivers" and select remove.

Driver here:

http://www.nvidia.com/object/winxp_2k_91.47.html

O yeah and the problem with not being able to play videos on media player happened when the computer was sent for repairs. When we got it back it couldnt play videos anymore.
I think because the repair people didnt install the drivers(cause there were a number of other things wrong which I fixed when I reformatted it.)
So the problem is quite old. The video controller should still be in the computer but I didnt put it together.