I know it's a bit of a necro-post, but I've stumbled across this same error in my Event Viewer while trying to make my Win8 computer rock-steady, and this was the first thread that came up.
Fun fact: AMD64 is a nickname, just like x86 is.
x86 means that the processor instruction set and architechture is compatible with the 86-series processor instruction set that came out ages ago -- the 386, 486, etc. "x86" processors have added quite a few extensions since then (SSE, MMX, etc.) and aren't truly 86-series compatible anymore, but the name stuck as essentially meaning a 32-bit processor.
If you recall, there was a time when AMD was ahead of the game in the home processor world. They were the first to bring 64-bit compatible processors to the consumer market in the early 2000s. Windows programmers put the appropriate drivers/etc. in a folder named "AMD64", and the rest is history. In many sections of programmer-speak (especially when drivers are concerned), "AMD64" simply means "64-bit".
As far as the actual issue is concerned, it seems that this error is caused by SxS (Side by Side), whose job appears to be to select a 64-bit DLL when available and fall back to a 32-bit one when necessary. It looks to me as though Waves may have planned a 64-bit version of the License Center and never ended up writing one. The "error" should probably be sitting in the "information" or "warning" category, because it's really not that critical (at least for this application!).
-Ki
Salem Beats