this is a module (driver) for a via chipset that is usually written in /etc/modules and is autoloaded at boot-process
so try
Code:
modprobe -v via-ircc
loading the module by hand and you'll see if you have this module and if it can be loaded. If not, than A) may be the new kernel has this module compiled in, B) may be the module depends on other module that should be loaded before this one, C) may be you removed some hardware from the pc, D) is the new kernel from the same series 2.4.XX or 2.6.XX, E) check what modules do you have loaded
hope it helpes