My windows cannot detect the co processor after i installed a new windows

I don't think you can run Windows 8 on your system.
What Microsoft say are the minimum requirements for a system to run Windows 8 can be found here
http://windows.microsoft.com/en-GB/windows-8/system-requirements
First, the processor needs to have certain features - SSE2, NX and PAE which I don't think the Sempron 3000+ has; and you be able to run only the 32-bit version if could run that because you don't have enough RAM, and your processor is a 32-bit processor.
Secondly, the 9250 isn't up to it. It doesn't have WDDM drivers, because it's not a true Direct 9X graphics card; it not being a DirectX 9 card is enough to preclude from running Windows 6 anyway.

Your processor, RAM and graphics card might be upgradeable to be able to support a 32-bit version of W8, but that may be more expensive than buying a (new) W8 computer anyway.

Anyway that's what my brief study of the topic has lead me to believe. It's a no.

On the other hand, see these:
http://answers.microsoft.com/en-us/windows/forum/windows_8-windows_install/amd-sempron-3000-for-windows-8/9b9c1659-63dc-4069-99fa-eb8e08040738
and
http://www.tomshardware.co.uk/forum/id-1806278/install-windows-cpu-amd-sempron-3000-ram-512-ddr-ddr-gpu-radeon-9250.html
(found by searching the internet with "running windows 8 on a sempron 3000+")
They say "Yes".

So I think more research needs to be done. Note the second article says the system will have terrible performance.

20.April,2014

Certain video cards are only compatible with certain processors on motherboards. AMD CPUs work with Nvidia and Intel CPUs work with certain graphics cards also. Are you sure it's even compatible?

Could be a bit issue, as window 7 sometime doesn't reconize a 64bit cpu if you install a 32bit operating system. What version of windows 7 are you using, home, basic, ultimate??? Some version will reconize it such as ultimate, and professional since they have xp installed on it. Most likely it's a bit issue since the athlon x2 are old model and with windows 7 32bit, it didn't reconize it, if you are installing the 32bit system.... microsoft is just trying to make money by issuing 1 key for 1 computer, and if you are resintalling the os, with a new hardware installed also, then it could also fail because the first time you install windows 7 with the hardware, the hardware is also registered to windows and furhter down the road if you try to install windows 7 with a new hardware, it wouldn't let you, or would crash.

Windows 7 is designed for latest and improved hardware. You are using an old system which was shipped with XP Operating System. If you are using a retail version on your System, then you will face the driver/device compatibility issues.

Co-processor driver error in the Device Manager is for the Chipset or Video driver which was not installed in the System properly.

It is really not possible to get Windows 7 Chipset driver for this Model. However, you can try.....
Connect to Internet
Right click on Co-Processor and select Properties
Go to Drivers tab and select Update driver...
Check if it can search online and download the required driver

If not, get back to XP.

Hello my friend,this is could happen because of driver problem or and more common operating system failure.Try to reinstall the windows again but i recommend you to make a clean install (format hard drive and install the new windows)

sorry, but learn how to install xp pro. Skip the internet connection. Plug the plug. Install internet AFTER the xp install. let it ride

i have sound driver install to motherboard D845G intel

The problem is that you have a P3 processor. THe only CPU capable of running a fire wire device, is a P4 or better.

yay I found a solution! so I kept getting the error about an MTP device, so I did a big search. I am running vista on a 32 bit processor. what you need to download is the MTP installation programme from windows. so click on http://support.microsoft.com/kb/939211
and then just select what processor speed you need. should do the trick! I also downloaded http://www.microsoft.com/downloads/details.aspx?FamilyId=A2E73160-E862-4F19-BB26-C0CAFE798955&displaylang=en initially, but it didn't appear to work. hope that you all get to the bottom of this frustrating problem :)

You need the manual to your motherboard to set it up in the BIOS. http://www.biostar-usa.com/docsmain.asp In the drop down menu select M7NCD ULTRA. I hope this helps. Let me know.