Yes, if you use EQPN, you need to load MQ2 first, otherwise it can mess stuff up. Might not crash you immediately, but it's still buggy. Also, if you have MQ2 and WinEQ/EQPN running, and you quit MQ2, EQ will crash (/unloading seems to work fine, but closing MQ2 gives a nice CTD).
I assumed he didn't have WinEQ.