I had the same problem. However, this article
http://support.microsoft.com/default...;en-us;Q321637 is for SoundBlaster Live Value boards. Maybe uninstall and reinstall drivers. worked for me.
Hope that helps.
augie
btw, this article came up when I used M$ help site with the error # you supplied. As to your keyboard problem, kbdclass is a driver. Suggest you do a repair install, as it is probably corrupt. That's as much as I know. As always, do a back up. Learned the hard way.Also, the info you supplied is exactly what is needed.