The one developed by sidhujag, I believe its the most recent one added to devcoin.org.
Ok, that's shakezula's installer and it should just be the same source and .exe packaged in an installer. Sorry he's the guy to ask on that as not heard of any problems previously, and sure he'll be along soon.
This is nothing I've heard of before, sorry to hear you've got problems. My installer simply packages the .exe's available directly in a nice and easy to install package, this sounds like an issue with the wallet.exe itself. I'm not sure what to check though, you might try resynching the block chain? I've sent multiple large tx's today from my wallet which is the same identical .exe, one of 40K and one of 500K with no issues and only the 1coin fee.