ok try this,
http://support.intel.com/support/chipsets/sb/cs-009236.htm
Download the following for Intel® 845 Chipset: Intel® Chipset Software Installation Utility, Intel® Application Accelerator
Also,
http://downloadfinder.intel.com/scripts-df-external/filter_results.aspx?strTypes=all&ProductID=889&OSFullName=Windows*+XP+Professional&lang=eng&strOSs=44&submit=Go%21
There is one problem..out of the 845 Chipset Family there are quite a few..It doesn't exactly say which one is yours..unless u can find out somehow.
..this is your chipset family.. one of these are yours
Intel® 845 chipset family-based boards
Intel® Desktop Board D845EPI
Intel® Desktop Board D845GEBV2
Intel® Desktop Board D845GERG2
Intel® Desktop Board D845GLVA
Intel® Desktop Board D845GVSR
Intel® Desktop Board D845GVFN
Intel® Desktop Board D845PECE
Intel® Desktop Board D845PEMY
Intel® Desktop Board D845PESV
Found on this website:
http://support.intel.com/support/motherboards/desktop/chipline1.htm
If you can figure out which exact version >_< ..once you do..click on the version..Scroll down to Software & Drivers..Click latest BIOS and driver updates...select your version of windows..(XP Professional I presume)
Click Go.. in the driver section you should find something regarding AC'97...download the driver onto your desktop or wherever it is your keep your downloaded files..Unistall the previous driver..reboot....install the new drivers u downloaded..reboot and vollllllllllla! you should have it ...keep me posted!
I really hope you can read this..cuz i can't but i'm sure your resolution isn't that high
well keep me posted!