Yeah, so in a brilliant move today, an MSMQ on my QA box was accidentally destroyed maliciously when I set Deny permissions for “Everyone”. Oops. Luckily this StackOverflow response from user Houman saved my ass. Simply navigate to C:\Windows\System32\msmq\storage\lqs and delete the queue. The names are cryptic, but lucky for me, that was the only queue that I touched and was able to locate it by ordering by timestamp.
[Blogging this so I can easily find this solution the next time I do this same boneheaded move.]