This only requires you to use the M'Board CD and load the various drivers from it but not directly from the setup program.
What you need to do is go into the Device Manager and update the individual devices by right clicking on them and then choosing the Update Option. Point the installer directly to the CD and then the folder with the drives for that device and they should install without a problem.
You may be prompted with an Unsigned Driver question asking you if you wish to proceed just click on [b]YES[/b] and it should install the drivers. The Realteck device that you mentioned here is the LAN connection, The sound drivers should be under the AC97 Folder on the M'Board CD in the Drivers Folder.
If you can not get these to install you'll have to perform a reload of the entire system and since you don't have any backup's in place it would be a good idea to get another HDD one of the SATA ones are quite cheap and use that as a Boot Drive to install Windows to and then use your existing drive as a Data Drive where you can recover your Data from as well as any utilities to reinstall. That way you'll get to keep all your data and programs. But you should really have a Backup Plan in place what would have happened if your HDD had of failed instead of the M'Board?
A reinstall can be done without loosing any of your programs or Data by doing an [b]In Place Reinstall[/b] as shown here
http://tinyurl.com/g4bv8
This will remove any unnecessary files and allow you to use the existing HDD with what is effectively a new install but retain both your data and programs. Though you'll have to reapply any Service Packs and Patches that have been released since your [b]Windows Install CD[/b] was made.
